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• The impact of air pollution on your health

Associate Professor of Epidemiology and Global Public Health

May 31, 2024

I am fascinated with how the world around us—specifically the air we breathe—impacts our health. Growing up in the smog of Los Angeles, the haze was more than just a backdrop for my day-to-day activities; it was also an early lesson in environmental health that has become the focus of my career.

As a researcher and instructor, I use modern principles of epidemiology, environmental health, exposure science, and biostatistics to study the impacts of our environment, including air pollution, on our health. 

Air pollution is important to think about because we are all obligatory breathers. We all need air to live—from the day we are born to the day we die- and our air contains contaminants that are harmful to our health. When we are experiencing high levels of pollution, like during wildfire events, we may be able to see the poor quality of our air but pollution is also present when it is invisible to us. 

Exposures to air pollution, even at levels below our current regulatory standards, can have lasting effects on health. For example, in my research, I've seen how sustained exposure to dirty air can damage children's lungs and lead to plaque buildup in the arteries of adults. While this sometimes surprises people, it’s helpful to think about air pollution as being similar to smoking cigarettes. Although the exposure is much more diluted, we are still breathing in microscopic particles and gases that may originate from smoke from traffic or industry or other sources. When we inhale these pollutants, they can trigger a chain reaction in the body, similar to cigarette smoke. This may start with inflammation as a protective response but over time can lead to chronic illnesses as severe as heart disease. The smallest pollutants can pass into our bloodstream and travel to important organs in our bodies like our brains, leading to sometimes less expected outcomes like dementia. Notably, air pollution increases the risk of disease among all people but certain groups, like young children, older adults, and people with chronic diseases likely face even greater risks from these exposures. 

Listen to "Breathing Easy: Navigating the Invisible Impact of Air Pollution" on Spreaker.

Even though air pollution levels have declined in the last several decades in the United States, those declines have not been the same everywhere and some neighborhoods still have high levels. Similarly, breathing in outdoor air is not the only cause of exposure. For example, children can experience high levels of exposure during their commutes to school if they ride very old diesel school buses. 

Another area of my research examines the impact of school bus emissions on children’s health. Our findings present a clear message: Cleaner school buses equal healthier kids, who show up to school more and learn more. Therefore, I really must applaud the investments by the EPA and the government in helping school districts purchase newer and cleaner buses. Our findings suggest that their investments have improved the health of children, resulting in direct educational and economic benefits.

In addition to exposures from the transportation sector and other more traditional industrial sources of air pollution, we have recently seen the impact of wildfires on air quality. In some parts of the country, wildfires have emerged as a leading source of population exposure to air pollution. Our group recently demonstrated that the health impacts of these events may extend beyond the times when the air is thick with smoke and repeated exposures may increase the risk of dementia among older adults. 

We found similar relationships with air pollution from agricultural activities where the application of neurotoxic pesticides are common, suggesting a compelling argument for a broader consideration of what constitutes an important pollution source for health.

We're all breathing in air pollution no matter where we live or what side of the political divide we land on, and we all experience the health impacts of those exposures.

Although we are learning that there are many health impacts of air pollution from both traditional and non-traditional sources, the silver lining is found in regulatory successes such as the National Ambient Air Quality Standards , which have significantly reduced pollution levels and contributed to the increased life expectancy of Americans. 

As an eternal optimist, I often think about the many ways in which we can intervene to reduce population exposures and improve health. This will require a commitment to clean air, but the call to action is clear. Therefore, what I would love to see is that, as a society, we start to value clean air, and we approach this as a nonpartisan issue. We're all breathing in air pollution no matter where we live or what side of the political divide we land on, and we're all experiencing the health impacts of those exposures. In my dream world, our society would value clean air and protect health.

About the author

Sara Adar is an associate professor of epidemiology at the University of MichiganSchool of Public Health. Her research primarily focuses on the effects of air pollution and noise on healthy aging, with additional interestsin global health, extreme weather events, and intervention strategies to improve health.

• Listen to Adar on the Population Healthy podcast: The invisible impacts of air pollution
• READ: Sara Adar’s research informs the EPA and helps safeguard kids
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Air Pollution: Everything You Need to Know

How smog, soot, greenhouse gases, and other top air pollutants are affecting the planet—and your health.

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What is air pollution?

What causes air pollution, effects of air pollution, air pollution in the united states, air pollution and environmental justice, controlling air pollution, how to help reduce air pollution, how to protect your health.

Air pollution  refers to the release of pollutants into the air—pollutants that are detrimental to human health and the planet as a whole. According to the  World Health Organization (WHO) , each year, indoor and outdoor air pollution is responsible for nearly seven million deaths around the globe. Ninety-nine percent of human beings currently breathe air that exceeds the WHO’s guideline limits for pollutants, with those living in low- and middle-income countries suffering the most. In the United States, the  Clean Air Act , established in 1970, authorizes the U.S. Environmental Protection Agency (EPA) to safeguard public health by regulating the emissions of these harmful air pollutants.

“Most air pollution comes from energy use and production,” says  John Walke , director of the Clean Air team at NRDC. Driving a car on gasoline, heating a home with oil, running a power plant on  fracked gas : In each case, a fossil fuel is burned and harmful chemicals and gases are released into the air.

“We’ve made progress over the last 50 years in improving air quality in the United States, thanks to the Clean Air Act. But climate change will make it harder in the future to meet pollution standards, which are designed to  protect health ,” says Walke.

Air pollution is now the world’s fourth-largest risk factor for early death. According to the 2020  State of Global Air  report —which summarizes the latest scientific understanding of air pollution around the world—4.5 million deaths were linked to outdoor air pollution exposures in 2019, and another 2.2 million deaths were caused by indoor air pollution. The world’s most populous countries, China and India, continue to bear the highest burdens of disease.

“Despite improvements in reducing global average mortality rates from air pollution, this report also serves as a sobering reminder that the climate crisis threatens to worsen air pollution problems significantly,” explains  Vijay Limaye , senior scientist in NRDC’s Science Office. Smog, for instance, is intensified by increased heat, forming when the weather is warmer and there’s more ultraviolet radiation. In addition, climate change increases the production of allergenic air pollutants, including mold (thanks to damp conditions caused by extreme weather and increased flooding) and pollen (due to a longer pollen season). “Climate change–fueled droughts and dry conditions are also setting the stage for dangerous wildfires,” adds Limaye. “ Wildfire smoke can linger for days and pollute the air with particulate matter hundreds of miles downwind.”

The effects of air pollution on the human body vary, depending on the type of pollutant, the length and level of exposure, and other factors, including a person’s individual health risks and the cumulative impacts of multiple pollutants or stressors.

Smog and soot

These are the two most prevalent types of air pollution. Smog (sometimes referred to as ground-level ozone) occurs when emissions from combusting fossil fuels react with sunlight. Soot—a type of  particulate matter —is made up of tiny particles of chemicals, soil, smoke, dust, or allergens that are carried in the air. The sources of smog and soot are similar. “Both come from cars and trucks, factories, power plants, incinerators, engines, generally anything that combusts fossil fuels such as coal, gasoline, or natural gas,” Walke says.

Smog can irritate the eyes and throat and also damage the lungs, especially those of children, senior citizens, and people who work or exercise outdoors. It’s even worse for people who have asthma or allergies; these extra pollutants can intensify their symptoms and trigger asthma attacks. The tiniest airborne particles in soot are especially dangerous because they can penetrate the lungs and bloodstream and worsen bronchitis, lead to heart attacks, and even hasten death. In  2020, a report from Harvard’s T.H. Chan School of Public Health showed that COVID-19 mortality rates were higher in areas with more particulate matter pollution than in areas with even slightly less, showing a correlation between the virus’s deadliness and long-term exposure to air pollution. 

These findings also illuminate an important  environmental justice issue . Because highways and polluting facilities have historically been sited in or next to low-income neighborhoods and communities of color, the negative effects of this pollution have been  disproportionately experienced by the people who live in these communities.

Hazardous air pollutants

A number of air pollutants pose severe health risks and can sometimes be fatal, even in small amounts. Almost 200 of them are regulated by law; some of the most common are mercury,  lead , dioxins, and benzene. “These are also most often emitted during gas or coal combustion, incineration, or—in the case of benzene—found in gasoline,” Walke says. Benzene, classified as a carcinogen by the EPA, can cause eye, skin, and lung irritation in the short term and blood disorders in the long term. Dioxins, more typically found in food but also present in small amounts in the air, is another carcinogen that can affect the liver in the short term and harm the immune, nervous, and endocrine systems, as well as reproductive functions.  Mercury  attacks the central nervous system. In large amounts, lead can damage children’s brains and kidneys, and even minimal exposure can affect children’s IQ and ability to learn.

Another category of toxic compounds, polycyclic aromatic hydrocarbons (PAHs), are by-products of traffic exhaust and wildfire smoke. In large amounts, they have been linked to eye and lung irritation, blood and liver issues, and even cancer.  In one study , the children of mothers exposed to PAHs during pregnancy showed slower brain-processing speeds and more pronounced symptoms of ADHD.

Greenhouse gases

While these climate pollutants don’t have the direct or immediate impacts on the human body associated with other air pollutants, like smog or hazardous chemicals, they are still harmful to our health. By trapping the earth’s heat in the atmosphere, greenhouse gases lead to warmer temperatures, which in turn lead to the hallmarks of climate change: rising sea levels, more extreme weather, heat-related deaths, and the increased transmission of infectious diseases. In 2021, carbon dioxide accounted for roughly 79 percent of the country’s total greenhouse gas emissions, and methane made up more than 11 percent. “Carbon dioxide comes from combusting fossil fuels, and methane comes from natural and industrial sources, including large amounts that are released during oil and gas drilling,” Walke says. “We emit far larger amounts of carbon dioxide, but methane is significantly more potent, so it’s also very destructive.” 

Another class of greenhouse gases,  hydrofluorocarbons (HFCs) , are thousands of times more powerful than carbon dioxide in their ability to trap heat. In October 2016, more than 140 countries signed the Kigali Agreement to reduce the use of these chemicals—which are found in air conditioners and refrigerators—and develop greener alternatives over time. (The United States officially signed onto the  Kigali Agreement in 2022.)

Pollen and mold

Mold and allergens from trees, weeds, and grass are also carried in the air, are exacerbated by climate change, and can be hazardous to health. Though they aren’t regulated, they can be considered a form of air pollution. “When homes, schools, or businesses get water damage, mold can grow and produce allergenic airborne pollutants,” says Kim Knowlton, professor of environmental health sciences at Columbia University and a former NRDC scientist. “ Mold exposure can precipitate asthma attacks  or an allergic response, and some molds can even produce toxins that would be dangerous for anyone to inhale.”

Pollen allergies are worsening  because of climate change . “Lab and field studies are showing that pollen-producing plants—especially ragweed—grow larger and produce more pollen when you increase the amount of carbon dioxide that they grow in,” Knowlton says. “Climate change also extends the pollen production season, and some studies are beginning to suggest that ragweed pollen itself might be becoming a more potent allergen.” If so, more people will suffer runny noses, fevers, itchy eyes, and other symptoms. “And for people with allergies and asthma, pollen peaks can precipitate asthma attacks, which are far more serious and can be life-threatening.”

More than one in three U.S. residents—120 million people—live in counties with unhealthy levels of air pollution, according to the  2023  State of the Air  report by the American Lung Association (ALA). Since the annual report was first published, in 2000, its findings have shown how the Clean Air Act has been able to reduce harmful emissions from transportation, power plants, and manufacturing.

Recent findings, however, reflect how climate change–fueled wildfires and extreme heat are adding to the challenges of protecting public health. The latest report—which focuses on ozone, year-round particle pollution, and short-term particle pollution—also finds that people of color are 61 percent more likely than white people to live in a county with a failing grade in at least one of those categories, and three times more likely to live in a county that fails in all three.

In rankings for each of the three pollution categories covered by the ALA report, California cities occupy the top three slots (i.e., were highest in pollution), despite progress that the Golden State has made in reducing air pollution emissions in the past half century. At the other end of the spectrum, these cities consistently rank among the country’s best for air quality: Burlington, Vermont; Honolulu; and Wilmington, North Carolina. 

No one wants to live next door to an incinerator, oil refinery, port, toxic waste dump, or other polluting site. Yet millions of people around the world do, and this puts them at a much higher risk for respiratory disease, cardiovascular disease, neurological damage, cancer, and death. In the United States, people of color are 1.5 times more likely than whites to live in areas with poor air quality, according to the ALA.

Historically, racist zoning policies and discriminatory lending practices known as  redlining  have combined to keep polluting industries and car-choked highways away from white neighborhoods and have turned communities of color—especially low-income and working-class communities of color—into sacrifice zones, where residents are forced to breathe dirty air and suffer the many health problems associated with it. In addition to the increased health risks that come from living in such places, the polluted air can economically harm residents in the form of missed workdays and higher medical costs.

Environmental racism isn't limited to cities and industrial areas. Outdoor laborers, including the estimated three million migrant and seasonal farmworkers in the United States, are among the most vulnerable to air pollution—and they’re also among the least equipped, politically, to pressure employers and lawmakers to affirm their right to breathe clean air.

Recently,  cumulative impact mapping , which uses data on environmental conditions and demographics, has been able to show how some communities are overburdened with layers of issues, like high levels of poverty, unemployment, and pollution. Tools like the  Environmental Justice Screening Method  and the EPA’s  EJScreen  provide evidence of what many environmental justice communities have been explaining for decades: that we need land use and public health reforms to ensure that vulnerable areas are not overburdened and that the people who need resources the most are receiving them.

In the United States, the  Clean Air Act  has been a crucial tool for reducing air pollution since its passage in 1970, although fossil fuel interests aided by industry-friendly lawmakers have frequently attempted to  weaken its many protections. Ensuring that this bedrock environmental law remains intact and properly enforced will always be key to maintaining and improving our air quality.

But the best, most effective way to control air pollution is to speed up our transition to cleaner fuels and industrial processes. By switching over to renewable energy sources (such as wind and solar power), maximizing fuel efficiency in our vehicles, and replacing more and more of our gasoline-powered cars and trucks with electric versions, we'll be limiting air pollution at its source while also curbing the global warming that heightens so many of its worst health impacts.

And what about the economic costs of controlling air pollution? According to a report on the Clean Air Act commissioned by NRDC, the annual  benefits of cleaner air  are up to 32 times greater than the cost of clean air regulations. Those benefits include up to 370,000 avoided premature deaths, 189,000 fewer hospital admissions for cardiac and respiratory illnesses, and net economic benefits of up to $3.8 trillion for the U.S. economy every year.

“The less gasoline we burn, the better we’re doing to reduce air pollution and the harmful effects of climate change,” Walke explains. “Make good choices about transportation. When you can, ride a bike, walk, or take public transportation. For driving, choose a car that gets better miles per gallon of gas or  buy an electric car .” You can also investigate your power provider options—you may be able to request that your electricity be supplied by wind or solar. Buying your food locally cuts down on the fossil fuels burned in trucking or flying food in from across the world. And most important: “Support leaders who push for clean air and water and responsible steps on climate change,” Walke says.

• “When you see in the news or hear on the weather report that pollution levels are high, it may be useful to limit the time when children go outside or you go for a jog,” Walke says. Generally, ozone levels tend to be lower in the morning.
• If you exercise outside, stay as far as you can from heavily trafficked roads. Then shower and wash your clothes to remove fine particles.
• The air may look clear, but that doesn’t mean it’s pollution free. Utilize tools like the EPA’s air pollution monitor,  AirNow , to get the latest conditions. If the air quality is bad, stay inside with the windows closed.
• If you live or work in an area that’s prone to wildfires,  stay away from the harmful smoke  as much as you’re able. Consider keeping a small stock of masks to wear when conditions are poor. The most ideal masks for smoke particles will be labelled “NIOSH” (which stands for National Institute for Occupational Safety and Health) and have either “N95” or “P100” printed on it.
• If you’re using an air conditioner while outdoor pollution conditions are bad, use the recirculating setting to limit the amount of polluted air that gets inside. 

This story was originally published on November 1, 2016, and has been updated with new information and links.

This NRDC.org story is available for online republication by news media outlets or nonprofits under these conditions: The writer(s) must be credited with a byline; you must note prominently that the story was originally published by NRDC.org and link to the original; the story cannot be edited (beyond simple things such as grammar); you can’t resell the story in any form or grant republishing rights to other outlets; you can’t republish our material wholesale or automatically—you need to select stories individually; you can’t republish the photos or graphics on our site without specific permission; you should drop us a note to let us know when you’ve used one of our stories.

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Environmental Pollution and Its Effect on Health

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Environmental pollution is one of the fundamental factors directly affecting climate change. Due to the active production and human use of fossil fuel products, industrial enterprises’ activities exert intense pressure on the environment. Air pollution has a direct negative impact not only on the climatic situation but also on people’s health throughout the country. The most vulnerable category of the population to climate change is adults over 65 since external factors most strongly influence their health.

Industrial enterprises for the extraction and processing of fossil fuels are located throughout the United States of America. Moreover, agricultural activities and natural disasters, such as seasonal forest fires, substantially impact the ecological situation. Moreover, given the air masses’ movement and the cyclical nature of many biological processes, it is fair to conclude that air pollution problems are national. First of all, the increased content of heavy particles such as CO2, N2O, and NH3 has a severe impact on the human respiratory system. The lungs receive additional stress due to respiratory diseases such as asthma and chronic objective pulmonary illness.

Furthermore, the lack of pure oxygen in the body harms other human organs: the brain, heart, and digestive system. According to new data from the World Health Organization (WHO) (2018), 9 out of 10 people breathe air with an increased concentration of pollutants. The WHO estimates that 7 million people die each year from the effects of inhaling air-containing particulate matter causing diseases such as stroke, heart disease, lung cancer, and pneumonia (World Health Organization, 2018). Older people are most vulnerable to environmental pollution, as their level of immunity weakens with age.

The negative impact of human-made pollution sources is actively affecting climate change. First of all, the above factors affect the increase in temperature in the atmosphere. According to the Lancet Countdown, temperature-related deaths in people over 65 have increased by 50% in the past twenty years (Watts et al., 2020). In the southern regions, there is an increased risk associated with an increase in atmospheric temperature, which in the long term will lead to droughts, floods, and, as a result, food crises. In addition, high temperatures increase the rate at which infectious diseases such as malaria spread, which also poses additional risks in some countries (Fairweather, 2020). Thus, the problem of climate change is not only national but also goes to the global level.

To solve this problem, a systematic and comprehensive approach is required, the application of which will take a relatively long period. In climate change, due to air pollution, the main force to prevent environmental disasters need to change the approach to the production of substances from fossil fuels. First of all, increased taxation and legislative acts limiting the number of harmful products will reduce the burden on the environment. Recent technological solutions allow the use of renewable energy sources with increasing efficiency. Large companies gradually lose the need to use coal or petroleum products. Conglomerates continue to use them due to low prices. Therefore, government intervention is needed, aimed not to adjusting the market as a harmful environmental consequence.

Due to the rapid development and massive use of modern technologies by the population, people’s way of life has changed. In the twenty-first century, the world community is ready to actively assist the government by applying the principles of conscious consumption and reducing the emissions of solid and gaseous waste into nature. People are beginning to use public transport, bicycles, and other transportation, emitting several times fewer emissions than cars.

Moreover, the environmental agenda is growing: citizens choose special packaging of products, strive to sort waste into categories, and the state needs to support private initiatives at the federal and local levels (Akhtar & Palagiano, 2018). First of all, it is necessary to create all the conditions to make it easier for people to choose environmentally friendly products, create additional waste sorting centers, and raise citizens’ education in environmental matters. This can be done both by legislative acts, there and by local decisions.

The problem of climate change and air pollution is global. Accordingly, a considerable number of people are subject to changes that affect their daily life. Consequently, there is an additional burden on the health care system. If the current trend continues, the situation runs the risk of spiraling out of control due to medical institutions’ limited capacity. The pandemic of the COVID-19 virus, which has spread worldwide, has demonstrated the existence of vulnerabilities in the healthcare system (Richardson, 2020). In cases where many people need the qualified help, medical institutions may not cope with the load. In the event of critical climate changes, implying global cataclysms, the healthcare system will not be able to cope with the task.

To sum up, climate change is primarily due to the high level of harmful substances emissions into the atmosphere. According to statistics, every year, more and more people over 65 years old directly feel the consequences of the changes. First of all, to reduce environmental change, it is necessary to introduce stringent measures for large industrial enterprises and agricultural centers. Increasing ecological awareness of the population also favorably contributes to curbing global warming and, as a result, reduces people’s vulnerability to disease.

Akhtar, R., & Palagiano, C. (2018). Climate change and air pollution . Switzerland: Springer International Publishing.

Watts, N., Amann, M., Arnell, N., Ayeb-Karlsson, S., Beagley, J., Belesova, K.,… & Capstick, S. (2020). The 2020 report of The Lancet Countdown on health and climate change: Responding to converging crises. The Lancet . Web.

World Health Organization. (2018). Air pollution and child health: Prescribing clean air: Summary (WHO Reference Number WHO/CED/PHE/18.01). Web.

Richardson, S. J., et al. (2020). Research with older people in a world with COVID-19: identification of current and future priorities, challenges and opportunities. Age and Ageing, 49 (6), 901-906.

Fairweather, V., Hertig, E., and Traidl‐Hoffmann, C. (2020). A brief introduction to climate change and health. Allergy, 75(9), 2352-2354. Web.

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Your environment. your health., air pollution and your health, introduction.

Air Pollution

Air pollution is a familiar environmental health hazard. We know what we’re looking at when brown haze settles over a city, exhaust billows across a busy highway, or a plume rises from a smokestack. Some air pollution is not seen, but its pungent smell alerts you.

It is a major threat to global health and prosperity. Air pollution, in all forms, is responsible for more than 6.5 million deaths each year globally , a number that has increased over the past two decades.

What Is Air Pollution?

Air pollution is a mix of hazardous substances from both human-made and natural sources.

Vehicle emissions, fuel oils and natural gas to heat homes, by-products of manufacturing and power generation, particularly coal-fueled power plants, and fumes from chemical production are the primary sources of human-made air pollution.

Nature releases hazardous substances into the air, such as smoke from wildfires, which are often caused by people; ash and gases from volcanic eruptions; and gases, like methane, which are emitted from decomposing organic matter in soils.

Traffic-Related Air Pollution (TRAP), a mixture of gasses and particles, has most of the elements of human-made air pollution: ground-level ozone, various forms of carbon, nitrogen oxides, sulfur oxides, volatile organic compounds, polycyclic aromatic hydrocarbons, and fine particulate matter.

Ozone , an atmospheric gas, is often called smog when at ground level. It is created when pollutants emitted by cars, power plants, industrial boilers, refineries, and other sources chemically react in the presence of sunlight.

Noxious gases , which include carbon dioxide, carbon monoxide, nitrogen oxides (NOx), and sulfur oxides (SOx), are components of motor vehicle emissions and byproducts of industrial processes.

Particulate matter (PM) is composed of chemicals such as sulfates, nitrates, carbon, or mineral dusts. Vehicle and industrial emissions from fossil fuel combustion, cigarette smoke, and burning organic matter, such as wildfires, all contain PM.

A subset of PM, fine particulate matter (PM 2.5) is 30 times thinner than a human hair. It can be inhaled deeply into lung tissue and contribute to serious health problems. PM 2.5 accounts for most health effects due to air pollution in the U.S.

Volatile organic compounds (VOC) vaporize at or near room temperature—hence, the designation volatile. They are called organic because they contain carbon. VOCs are given off by paints, cleaning supplies, pesticides, some furnishings, and even craft materials like glue. Gasoline and natural gas are major sources of VOCs, which are released during combustion.

Polycyclic aromatic hydrocarbons (PAH) are organic compounds containing carbon and hydrogen. Of more than 100 PAHs known to be widespread in the environment, 15 are listed in the Report on Carcinogens . In addition to combustion, many industrial processes, such as iron, steel, and rubber product manufacturing, as well as power generation, also produce PAHs as a by-product. PAHs are also found in particulate matter.

Air Pollution and Climate Change

Air pollution and climate change affect each other through complex interactions in the atmosphere. Air pollution is intricately linked with climate change because both problems come largely from the same sources, such as emissions from burning fossil fuels. Both are threats to people’s health and the environment worldwide. Read more: Health Impacts of Air Quality .

What is NIEHS Doing?

Over its 50-plus year history, NIEHS has been a leader in air pollution research. The institute continues to fund and conduct research into how air pollution affects health and the population groups who are most affected.

How does air pollution affect our health?

When the National Ambient Air Quality Standards were established in 1970, air pollution was regarded primarily as a threat to respiratory health. In 1993, NIEHS researchers published the landmark Six Cities Study , which established an association between fine particulate matter and mortality.

Air pollution exposure is associated with oxidative stress and inflammation in human cells, which may lay a foundation for chronic diseases and cancer. In 2013, the International Agency for Research on Cancer of the World Health Organization (WHO) classified air pollution as a human carcinogen .

Mortality rates related to air pollution are a concern. Exposure to the air pollutant PM2.5 is associated with an increased risk of death.

A team of researchers, partially funded by NIEHS, found that deaths decreased after air pollution regulations were implemented and coal-powered plants were retired. The study data covered 21 years. More specifically, they found exposure to PM2.5 from coal was associated with a mortality risk that was twice as high as the risk from exposure to PM2.5 from all sources. PM2.5 from coal is high in sulfur dioxide, black carbon, and metals.

Public health concerns include cancer, cardiovascular disease, respiratory diseases, diabetes mellitus, obesity, and reproductive, neurological, and immune system disorders.

Research on air pollution and health effects continually advances.

• A large study of more than 57,000 women found living near major roadways may increase a woman’s risk for breast cancer .
• The NIEHS Sister Study found other airborne toxic substances, especially methylene chloride, which is used in aerosol products and paint removers, are also associated with increased risk of breast cancer .
• Occupational exposure to benzene, an industrial chemical and component of gasoline, can cause leukemia and is associated with non-Hodgkin’s Lymphoma .
• A long-term study, 2000-2016, found an association between lung cancer incidence and increased reliance on coal for energy generation.

Cardiovascular Disease

• Fine particulate matter can impair blood vessel function and speed up calcification in arteries .
• NIEHS researchers established links between short-term daily exposure by post-menopausal women to nitrogen oxides and increased risk of hemorrhagic stroke .
• For some older Americans, exposure to TRAP can result in lowered levels of high-density lipoprotein , sometimes called good cholesterol, increasing their risk for cardiovascular disease.
• According to a National Toxicology Program (NTP) report , TRAP exposure also increases a pregnant woman’s risk for dangerous changes in blood pressure, known as hypertensive disorders, which are a leading cause of pre-term birth, low birth weight, and maternal and fetal illness and death.

Respiratory Disease

• Air pollution can affect lung development and is implicated in the development of emphysema , asthma, and other respiratory diseases, such as chronic obstructive pulmonary disease (COPD).
• Increases in asthma prevalence and severity are linked to urbanization and outdoor air pollution. Children living in low-income urban areas tend to have more asthma cases than others. Research published in 2023 tied two air pollutants, ozone and PM2.5, to asthma-related changes in children’s airways.
• PM and nitrogen oxide are linked to chronic bronchitis .
• In 2020, a major public health challenge was confluence of the COVID-19 pandemic and wildfires across the western U.S. Building on a well-established connection between air pollution and respiratory-tract infections, a study linked wildfire smoke with additional COVID-19 cases and deaths .

Whom does air pollution affect the most?

Air pollution affects everyone’s health, but certain groups may be harmed more. Almost 9 out of 10 people who live in urban areas worldwide are affected by air pollution.

NIEHS-funded research indicates there are racial or ethnic and socioeconomic disparities in air pollution emissions. Air pollution emissions have decreased over past decades but the changes vary by demographics . This research found that people with annual incomes above $70,000 generally experience greater declines in industry, energy, transportation, residential, and commercial-related emissions than do people with lower incomes.

The NIEHS-funded Children’s Health Study at the University of Southern California is one of the largest studies of the long-term effects of air pollution on children’s respiratory health. Among its findings:

• Higher air pollution levels increase short-term respiratory infections, which lead to more school absences.
• Children who play several outdoor sports and live in high ozone communities are more likely to develop asthma.
• Children living near busy roads are at increased risk for asthma.
• Children with asthma who were exposed to high levels of air pollutants were more likely to develop bronchitis symptoms.
• Living in communities with higher pollution levels can cause lung damage .

Other studies on women and children

• NIEHS-funded researchers from the University of California, Davis, Environmental Health Sciences Center are conducting the Bio-Specimen and Fire Effects (B-SAFE) Study . This ongoing project seeks to discover if and how recent wildfires and their smoke affected pregnant women and their babies. Begun in 2017, study participants are pregnant women who were living in Northern California when the 2018, 2019, or 2020 wildfires occurred there.
• Breathing PM 2.5, even at relatively low levels, may alter the size of a child's developing brain , which may ultimately increase the risk for cognitive and emotional problems later in adolescence.
• Prenatal exposure to PAHs was associated with brain development effects, slower processing speed, attention-deficit and hyperactivity disorder (ADHD) symptoms, and other neurobehavioral problems in urban youth .
• In New York City, prenatal exposure to air pollution may play a role in childhood ADHD-related behavior problems.
• Prenatal exposure to particulate matter was associated with low birth weight .
• Women exposed to high levels of fine particulate matter during pregnancy, particularly in the third trimester, may have up to twice the risk of having a child with autism .
• Second and third trimester exposure to PM 2.5 might increase the chance of those children having high blood pressure in early life .

Older adults

• Alzheimer’s disease and related dementias are a public health challenge for aging populations. NIEHS-funded researchers at the University of Washington identified a link between air pollution and dementias. This well-conducted study adds considerable evidence that ambient air fine particles increase risk of dementias . Conversely, a multi-year study published in 2022 shows improved air quality is associated with lower risk of dementia in older women. The researchers also stated this decline in dementia risk was equivalent to taking nearly 2 1/2 years off the age of the women studied.
• Air pollution was linked to a greater chance of developing several neurological disorders , including Parkinson's disease, Alzheimer's disease, and other dementias. Hospital admissions data from 63 million older adults in the U.S., obtained over 17 years (2000-2016), was analyzed along with estimated PM 2.5 concentrations by zip code to conduct the study.
• In older adults, long-term exposure to TRAP may significantly hasten physical disabilities . The risk is more pronounced among racial minorities and lower-income people.
• Osteoporosis affects women more than men. A large study associated high levels of air pollutants with bone damage , particularly in the lumbar spine, among postmenopausal women. This study expands previous findings linking air pollution and bone damage.
• Nutrients may counter some harmful effects from air pollution. A 2020 study found omega-3 fatty acids , obtained by eating certain fish, may protect against PM 2.5-associated brain shrinkage in older women.

Rural dwellers

• NIEHS supported a translational research project,  Addressing Air Pollution and Asthma (1MB) , that may lead to improved health for children suffering from asthma. They found that certain agricultural practices contribute to poor air quality and asthma among children. The team combined high-efficiency particulate air (HEPA) cleaners and a home-based education program to reduce children’s exposure to pollutants in the home.
• Exposure to smoke from agricultural burns for as little as two weeks per year may worsen children's respiratory health outcomes, according to research supported by NIEHS. The study was conducted in response to community concerns about children's heath in Imperial Valley, a rural, agricultural area in southern California. Such agricultural burning is done to clear post-harvest crop remnants. This form of clearing is inexpensive, and farmers in the area do not have other economical methods for disposing of waste.
• In the rural U.S., large-scale animal feeding operations might compromise regional air quality through emission of pollutants, such as ammonia gas. A study found acute lung function problems in children with asthma in such areas.

NIEHS and community involvement

NIEHS supports community participation in the research process and encourages collaborative approaches that build capacity in communities to address environmental health concerns. Community-engaged research and citizen science are two types of collaborative research approaches.

For example, NIEHS helps residents of Imperial County, California track air pollution through a network of 40 community-run monitors. In this county, long-term improvements in air quality were associated with significant lung-function improvement in children.

In another example, NIEHS grant recipients developed community-level tactics and public policies for reducing exposure to TRAP:

• Using high-efficiency particulate air (HEPA) filtration.
• Building land-use buffers and vegetation barriers.
• Improving urban design with gardens, parks, and street-side trees.
• Creating active-travel options, such as bicycling and walking paths.

THE (Trade, Health, Environment) Impact Project brings together researchers and community groups to find solutions for communities affected by trade-related pollution, such as ports and roadways with trucking.

Why improving air quality matters

• Air pollution and birth outcomes are linked as global public health concerns. Researchers analyzed indoor and outdoor air pollution data from all inhabited continents along with key pregnancy outcomes. Their findings indicate efforts to reduce PM2.5 exposure could lead to significant reductions in the number of low-birth weight and pre-term birth infants worldwide . Air pollution reduction would be especially beneficial for children born in low- and middle-income countries.
• Among children in Southern California, decreases in ambient nitrogen dioxide and PM 2.5 were associated with fewer cases of asthma .
• An NIEHS-funded study found that a mixture of several B vitamins may protect DNA from changes attributable to PM 2.5 air pollution.
• Bronchitis symptoms declined as pollution levels dropped in the Los Angeles region.
• Improving air quality may improve cognitive function and reduce dementia risk, according to studies supported in part by NIH and the Alzheimer's Association.
• When fossil-fuel power plants close, nearby air pollution is reduced. A study found the incidence of preterm births went down within 5 kilometers of retired coal and oil-powered plant locations.

Further Reading

Stories from the environmental factor (niehs newsletter).

• Air Pollution May Trigger DNA Modifications Tied to Alzheimer’s Disease (April 2024)
• Scientific Journeys: Using AI to Track a Major Source of Pollution (March 2024)
• Burn Pits’ Complex Emissions Simulated in NIEHS Grantee’s Laboratory (December 2023)
• Indoor Wood-burning May Be Linked to Lung Cancer in U.S. Women (September 2023)
• Everyday Air Pollution Can Harm Brain Development in Adolescents (September 2023)
• Wildfire Smoke, Other Air Pollution Can Harm Brain Health, Expert Says (August 2023)
• Burning Plastic Can Affect Air Quality, Public Health (August 2022)
• Interventions Needed to Slow Climate-driven Air Pollution, Researchers Note (March 2022)
• Air Pollution and Forever Chemicals Continue to Pose Health Risks (March 2022)
• Air Pollution Affects Children’s Brain Structure (February 2022)
• Increasing Evidence Links Air Pollution With Breast Cancer (November 2021)
• Fine Particulate Air Pollution Associated With Higher Dementia Risk (September 2021)

Printable Fact Sheets

Fact sheets.

Breast Cancer: Why the Environment Matters

Climate Change and Human Health

Lung Health and Your Environment

Partnerships for Environmental Public Health (PEPH)

• When Wildfires Hit Close to Home is about NIEHS-funded research on the complexity of urban wildfires and how they may affect human health.
• Wildfire Smoke and Children's Health

Additional Resources

• Air Pollution Linked to Dementia Cases (September 2023) – In this edition of NIH Research Matters, read about findings from the Health and Retirement Study, funded by the National Institute on Aging, that showed higher air pollution exposure was linked to an increased risk of dementia. After consideration of all sources, fine particulate matter, or PM2.5, from agriculture and wildfires were specifically associated with an increased risk of dementia. Reducing such exposures might help lower the incidence of dementia. The study was published in JAMA Internal Medicine.
• AirNow , a tool developed in partnership by several government agencies, allows you to monitor air quality in real time anywhere in the U.S. Simply enter your zip code as indicated on the website.
• EPA's Air Sensor Toolbox provides information on the operation and use of air-sensor monitoring systems for technology developers, air-quality managers, citizen scientists, and the public.
• NIH Climate Change and Health Initiative – This solutions-focused research initiative aims to reduce the health consequences associated with extreme weather events and evolving climate conditions. NIH has a strong history of creating innovative tools, technologies, and data-driven solutions to address global environmental problems.
• Smoke-ready Toolbox for Wildfires is a compendium of resources from the EPA to help educate you about the risks of smoke exposure and actions that protect your health.

Related Health Topics

• Exposure Science
• Gene and Environment Interaction
• Lung Diseases

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Essay on Air Pollution for Students and Children

500+ words essay on air pollution.

Essay on Air Pollution – Earlier the air we breathe in use to be pure and fresh. But, due to increasing industrialization and concentration of poisonous gases in the environment the air is getting more and more toxic day by day. Also, these gases are the cause of many respiratory and other diseases . Moreover, the rapidly increasing human activities like the burning of fossil fuels, deforestation is the major cause of air pollution.

How Air Gets Polluted?

The fossil fuel , firewood, and other things that we burn produce oxides of carbons which got released into the atmosphere. Earlier there happens to be a large number of trees which can easily filter the air we breathe in. But with the increase in demand for land, the people started cutting down of trees which caused deforestation. That ultimately reduced the filtering capacity of the tree.

Moreover, during the last few decades, the numbers of fossil fuel burning vehicle increased rapidly which increased the number of pollutants in the air .

Causes Of Air Pollution

Its causes include burning of fossil fuel and firewood, smoke released from factories , volcanic eruptions, forest fires, bombardment, asteroids, CFCs (Chlorofluorocarbons), carbon oxides and many more.

Besides, there are some other air pollutants like industrial waste, agricultural waste, power plants, thermal nuclear plants, etc.

Greenhouse Effect

The greenhouse effect is also the cause of air pollution because air pollution produces the gases that greenhouse involves. Besides, it increases the temperature of earth surface so much that the polar caps are melting and most of the UV rays are easily penetrating the surface of the earth.

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Effects Of Air Pollution On Health

Moreover, it increases the rate of aging of lungs, decreases lungs function, damage cells in the respiratory system.

Ways To Reduce Air Pollution

Although the level of air pollution has reached a critical point. But, there are still ways by which we can reduce the number of air pollutants from the air.

Reforestation- The quality of air can be improved by planting more and more trees as they clean and filter the air.

Policy for industries- Strict policy for industries related to the filter of gases should be introduced in the countries. So, we can minimize the toxins released from factories.

Use of eco-friendly fuel-  We have to adopt the usage of Eco-friendly fuels such as LPG (Liquefied Petroleum Gas), CNG (Compressed Natural Gas), bio-gas, and other eco-friendly fuels. So, we can reduce the amount of harmful toxic gases.

To sum it up, we can say that the air we breathe is getting more and more polluted day by day. The biggest contribution to the increase in air pollution is of fossil fuels which produce nitric and sulphuric oxides. But, humans have taken this problem seriously and are devotedly working to eradicate the problem that they have created.

Above all, many initiatives like plant trees, use of eco-friendly fuel are promoted worldwide.

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Effects of Air Pollution on Health

Air pollution refers to the presence of substances in the air at concentrations that affect human health or the environment. Clean air is important for clean health, and air pollution threatens health in many ways. Every individual has a fundamental right to access free and unlimited clean air. The human lung acts as an interface between the body and the environment. On average, an individual takes in about 10 million breaths annually.

In the process, there is a high possibility of toxic substances reaching the lungs and other organs where they can cause harmful effects. Therefore, there is a need for an appropriate policy response to minimize levels of air pollutants such as particulate matter, nitrogen dioxide, ozone, carbon monoxide, and others (Koenig 165). Reduction in air pollution will bring considerable health benefits to humans. Adequate understanding of these effects is a significant step towards establishing successful policies to minimize these risks. This paper discusses the main effects of air pollution on health, the main air pollutants, and the policies necessary to reduce the levels of air pollution.

Exposure to air pollution causes several health problems, starting from modest changes in the respiratory tract and the affected pulmonary function, moving to restricted performance, emergency rooms visits and hospital admissions, and to deaths (Saldiva 220). Air pollution has adverse effects not only on the respiratory system but affects the cardiovascular system as well. This is true from both acute and chronic exposures to air pollutants.

The most adverse effects of air pollution in terms of the overall health problems include reduction in life expectancy of average populations, related to long-term exposures to high levels of air pollution with particulate matter. It is necessary to understand adequately the nature and magnitude of the effects of air pollutants on health. Air pollutants constitute an important overall component of both outdoor and indoor air and are known to cause health effects, essentially with individuals with pre-existing illnesses.

Air pollution poses a considerable threat to health causing morbidity and reduced life expectancy. The effects of air pollution on human health can be short term or long term. Both short term and long term effects can cause varying degrees of damage to human health. Short term and long term effects may include minor irritations and death respectively (Bauer 1093). Toxic air particles have short term effects such as; immediate irritation to the eyes or throat and in the long term causes death due to respiratory failure or heart attacks (Bauer 1092).

Population subgroups are affected differently by air pollution risks. Variations in terms of sensitivity exposure occur due to nutrition issues, state of general health, and genetic predisposition. Vulnerable groups under high risk include infants and young children, the elderly, pregnant mothers and their unborn fetuses, individuals suffering from other diseases, malnourished, and others (Koenig 165). It is necessary to identify these vulnerable groups because they are the first to be affected as the levels of air pollution increase. Generally, only a minority of the total population is affected by high levels of exposure. Therefore, any excess to mortality due to a pollutant is likely to be restricted to a small group of the population (Bauer 1094).

The Main Air Pollutants

The main constituents of air pollution include a highly variable, complex mixture of different substances, such as smog, that is, photochemical oxidants, carbon monoxide, nitrogen oxides, sulfur oxides, and particulates (Koenig 165). There are many different components in the troposphere that can cause potential effects on human health and the general environment. This paper focuses on pollutants such as particulate matter, ozone, and nitrogen dioxide.

First, long-term exposure to high levels of pollution with particulate matter causes a significant reduction in the life expectancy of the average population (Douglas 6). Important health effects associated with particulate matter in the short term exposure include respiratory problems, increase in mortality, inflammatory reactions in the lungs, increase in hospital admissions, and adverse effects on the cardiovascular system (Dominici et al., 10). The health effects associated with long-term exposure of particulate matter include; reduction in lung function in children and adults, reduced lung function development, reduction in life expectancy due to mainly cardiopulmonary deaths and lung cancer, and others (Koenig 139).

Particulates absorb various chemicals and increase their penetration and longevity in the lungs. They also condense water and vapor and augment the effects of gaseous pollutants like sulphur oxides. The main particulates of concern include; lead, asbestos, mercury, and other major metals. Effects of lead include; anemia, gastrointestinal cramping, and impaired neural functioning (Koenig 128). Asbestos affects pulmonary lesions and mesothelial tissue damages. Asbestos is also associated linked to pulmonary cancer. Lead poisoning on the other hand may affect retardation and possibly hyperactivity in children (Koenig 129).

Second, the ozone is the main toxic element of the oxidants. All photochemical oxidants are manufactured by processes of photosynthesis involving the emissions of hydrocarbon and nitrogen oxides from internal combustion (Evans 107). Health effects associated with short-term exposure to the ozone include; increase in mortality, an increase in hospital admissions, inflammatory reactions to the lungs, an increase in medication usage, adverse effects on pulmonary function, and others. Health effects associated with long term exposure include reduction in lung function (Koenig 139).

Third, the Combustion of fossils is the major source of ambient sulphur oxides. Exposure to ambient sulfur oxides irritates upper respiratory passage in humans, reducing mucus clearance, and reducing pulmonary functioning (Evans 106). Studies on greater exposures cause nasal lesions, bronchitis, pneumonia, and severe pulmonary disorder. Nitrogen oxides are ubiquitous in the air and produced by fossil fuel combustion in motor vehicles and electrical power production. It causes reduced pulmonary functioning, reduced immunity to fight diseases, diminished weight gain, and bronchial inflammation (Evans 107).

The health effects caused by nitrogen dioxide in the short term exposure include; increase in mortality, an increase in hospital admissions, an increase in airwaves allergic inflammation reactions, and effects in pulmonary functions, specifically in asthmatics. Health effects related to long term exposure include increased probability of respiratory symptoms.

Carbon monoxide is caused by incomplete combustion primarily emitted from motor vehicles or cigarette smoking. It causes headaches, nausea, and dizziness associated with deprivation of oxygen. Greater exposure to carbon monoxide can result to result to cortical cellular structure, altered heartbeat, vascular diseases, impaired liver functioning, and fetal growth retardation (Evans 106). Exposure to carbon monoxide is also associated with low birth weight, increased prenatal deaths, increased distress in patients, cardiovascular ailments, and possible infection of cardiovascular disease (Evans 107).

In sum exposure to air pollution specifically, particulate matter, and ozone pose a significant risk to human health. Recent evidence suggests, however, that ozone levels lower than those experienced during episodes of “summer smog” may have considerable effects on human health (Koenig 44).

Policies Necessary to Reduce Air Pollution Levels and Human exposure

The causes and sources of air pollution are more complex and intricate. Therefore the matrix of strategies to reduce air pollution demands broad policy combinations. This necessitates the need to implement appropriate policy strategies to reduce air pollution at all levels and mitigate its adverse effects on human health. These measures include national policy and regulatory framework; local monitoring of air pollution; public information and health warnings; land use planning; transport policy; and energy policy.

First, the national air pollution standards need to be developed to assist local air pollution management. The national government must offer expertise and guidance not available locally. They can also assist local authorities with the fiscal, legal, and institutional mandate for taking action on air pollution locally. Second, local air pollution monitoring must be put in place to identify the changes in pollution concentrations.

The monitoring mechanism must support the overall air pollution management strategy. Three, use public information systems to warn people of severe air pollution consequences, offer control measures, and in the long run increase public awareness of air pollution problems. Fourth, establish education and awareness programs to help people take measures to avoid exposure. Fifth, there is a need to reduce sulfur and organic toxic elements from relevant petroleum products and encouragement of increased use of locally applicable renewable energy to reduce emissions.

In summary, air pollution affects human health. The quality of air affects our health, interpersonal behavior, mood, attitudes, outdoor activities, outdoor activities, and others. Most research on air pollution effects on health tend to concentrate more on physical outcomes such as mortality or diseases. I would suggest the need to look at air quality in terms of policy strategies that may be linked to air quality such as discomfort, irritability, depression, and anxiety.

There is a need to document the adverse effects of different air pollutants on human health, and this should include diseases and the estimated reduction in life expectancy as a result of toxic air. All evidence of increased mortality in highly polluted areas needs to be documented. Relevant authorities must implement regulations by authorities to minimize emissions of toxic air substances. In essence, there is a need for accurate information on the effects of air pollution on health as a basis for establishing effective strategies to minimize these effects.

Works Cited

Brauer, Michael. “Air Pollution from Traffic and Development of Respiratory.” American Journal of Respiratory and Critical Care Medicine, 166 (2002): 1092-1098. Web.

Dominici, Francesca, Peng Roger, Bell Michel, Pham Luu, and Zeger Scot. Particulate Air Pollution and Hospital Admission for Cardiovascular and Respiratory Diseases. The Journal of the American Medical Association , 295 (2006): 10-21.

Douglas, James, and Waller Ryan. Air Pollution and Respiratory Infection in Children. British Medical Association, 20 (1966):1-8.

Evans, Gary. Environmental Stress. Cambridge: Cambridge University Press, 1984.

Koenig, Jane. Health Effects of Ambient Air Pollution. New York: Springer, 2000.

Saldiva, Lichtenfel, and Paiva Barone. Between Air Pollution and Mortality Due to Respiratory Diseases. Environmental Research Journal, 65 (1994): 218-225.

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• Health impacts
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Pollutants not only severely impact public health, but also the earth’s climate and ecosystems globally.

How are air pollution and climate change linked in terms of health risks? 

Pollutants not only severely impact public health, but also the earth’s climate and ecosystems globally. Most policies to reduce air pollution offer a “win-win” strategy for both health and climate. Lower levels of air pollution result in better cardiovascular and respiratory health of populations in both the long- and short-term. Reducing ambient and household air pollution can also reduce emissions of carbon dioxide (CO2) and short-lived climate pollutants, such as black carbon particles and methane, therefore contributing to the near- and long-term mitigation of climate change. 

Are there common sources of air pollution and climate-changing pollutants?  

Many of the sources of outdoor air pollution are also sources of high CO2 emissions. For example, the use of fossil fuels for power generation, industry and polluting transport are all major sources of both particulate matter and CO2.  

What are short-lived climate pollutants and how do they impact climate and health?  

Air pollutants, such as methane and black carbon, are powerful short-lived climate pollutants (SLCPs) that contribute to climate change and ill health . Although SLCPs persist in the atmosphere for short lifetimes, their global warming potential is often much greater than carbon dioxide (CO2).  

Black carbon, a component of fine particulate matter, is one of the largest contributors to global warming after CO2. Black carbon warms the earth’s atmosphere by absorbing sunlight, thereby accelerating the melting of snow and ice.  

Methane, another SLCP, is a potent greenhouse gas that is 84 times more powerful than CO2, and is a precursor to the air pollutant ozone. Ozone and black carbon affect weather processes and decrease agricultural yields, thus threatening food security. 

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Review article, effects of water pollution on human health and disease heterogeneity: a review.

• 1 Research Center for Economy of Upper Reaches of the Yangtse River/School of Economics, Chongqing Technology and Business University, Chongqing, China
• 2 School of Economics and Management, Huzhou University, Huzhou, China

Background: More than 80% of sewage generated by human activities is discharged into rivers and oceans without any treatment, which results in environmental pollution and more than 50 diseases. 80% of diseases and 50% of child deaths worldwide are related to poor water quality.

Methods: This paper selected 85 relevant papers finally based on the keywords of water pollution, water quality, health, cancer, and so on.

Results: The impact of water pollution on human health is significant, although there may be regional, age, gender, and other differences in degree. The most common disease caused by water pollution is diarrhea, which is mainly transmitted by enteroviruses in the aquatic environment.

Discussion: Governments should strengthen water intervention management and carry out intervention measures to improve water quality and reduce water pollution’s impact on human health.

Introduction

Water is an essential resource for human survival. According to the 2021 World Water Development Report released by UNESCO, the global use of freshwater has increased six-fold in the past 100 years and has been growing by about 1% per year since the 1980s. With the increase of water consumption, water quality is facing severe challenges. Industrialization, agricultural production, and urban life have resulted in the degradation and pollution of the environment, adversely affecting the water bodies (rivers and oceans) necessary for life, ultimately affecting human health and sustainable social development ( Xu et al., 2022a ). Globally, an estimated 80% of industrial and municipal wastewater is discharged into the environment without any prior treatment, with adverse effects on human health and ecosystems. This proportion is higher in the least developed countries, where sanitation and wastewater treatment facilities are severely lacking.

Sources of Water Pollution

Water pollution are mainly concentrated in industrialization, agricultural activities, natural factors, and insufficient water supply and sewage treatment facilities. First, industry is the main cause of water pollution, these industries include distillery industry, tannery industry, pulp and paper industry, textile industry, food industry, iron and steel industry, nuclear industry and so on. Various toxic chemicals, organic and inorganic substances, toxic solvents and volatile organic chemicals may be released in industrial production. If these wastes are released into aquatic ecosystems without adequate treatment, they will cause water pollution ( Chowdhary et al., 2020 ). Arsenic, cadmium, and chromium are vital pollutants discharged in wastewater, and the industrial sector is a significant contributor to harmful pollutants ( Chen et al., 2019 ). With the acceleration of urbanization, wastewater from industrial production has gradually increased. ( Wu et al., 2020 ). In addition, water pollution caused by industrialization is also greatly affected by foreign direct investment. Industrial water pollution in less developed countries is positively correlated with foreign direct investment ( Jorgenson, 2009 ). Second, water pollution is closely related to agriculture. Pesticides, nitrogen fertilizers and organic farm wastes from agriculture are significant causes of water pollution (RCEP, 1979). Agricultural activities will contaminate the water with nitrates, phosphorus, pesticides, soil sediments, salts and pathogens ( Parris, 2011 ). Furthermore, agriculture has severely damaged all freshwater systems in their pristine state ( Moss, 2008 ). Untreated or partially treated wastewater is widely used for irrigation in water-scarce regions of developing countries, including China and India, and the presence of pollutants in sewage poses risks to the environment and health. Taking China as an example, the imbalance in the quantity and quality of surface water resources has led to the long-term use of wastewater irrigation in some areas in developing countries to meet the water demand of agricultural production, resulting in serious agricultural land and food pollution, pesticide residues and heavy metal pollution threatening food safety and Human Health ( Lu et al., 2015 ). Pesticides have an adverse impact on health through drinking water. Comparing pesticide use with health life Expectancy Longitudinal Survey data, it was found that a 10% increase in pesticide use resulted in a 1% increase in the medical disability index over 65 years of age ( Lai, 2017 ). The case of the Musi River in India shows a higher incidence of morbidity in wastewater-irrigated villages than normal-water households. Third, water pollution is related to natural factors. Taking Child Loess Plateau as an example, the concentration of trace elements in water quality is higher than the average world level, and trace elements come from natural weathering and manufacture causes. Poor river water quality is associated with high sodium and salinity hazards ( Xiao et al., 2019 ). The most typical water pollution in the middle part of the loess Plateau is hexavalent chromium pollution, which is caused by the natural environment and human activities. Loess and mudstone are the main sources, and groundwater with high concentrations of hexavalent chromium is also an important factor in surface water pollution (He et al., 2020). Finally, water supply and sewage treatment facilities are also important factors affecting drinking water quality, especially in developing countries. In parallel with China rapid economic growth, industrialization and urbanization, underinvestment in basic water supply and treatment facilities has led to water pollution, increased incidence of infectious and parasitic diseases, and increased exposure to industrial chemicals, heavy metals and algal toxins ( Wu et al., 1999 ). An econometric model predicts the impact of water purification equipment on water quality and therefore human health. When the proportion of household water treated with water purification equipment is reduced from 100% to 90%, the expected health benefits are reduced by up to 96%.. When the risk of pretreatment water quality is high, the decline is even more significant ( Brown and Clasen, 2012 ).

To sum up, water pollution results from both human and natural factors. Various human activities will directly affect water quality, including urbanization, population growth, industrial production, climate change, and other factors ( Halder and Islam, 2015 ) and religious activities ( Dwivedi et al., 2018 ). Improper disposal of solid waste, sand, and gravel is also one reason for decreasing water quality ( Ustaoğlua et al., 2020 ).

Impact of Water Pollution on Human Health

Unsafe water has severe implications for human health. According to UNESCO 2021 World Water Development Report , about 829,000 people die each year from diarrhea caused by unsafe drinking water, sanitation, and hand hygiene, including nearly 300,000 children under the age of five, representing 5.3 percent of all deaths in this age group. Data from Palestine suggest that people who drink municipal water directly are more likely to suffer from diseases such as diarrhea than those who use desalinated and household-filtered drinking water ( Yassin et al., 2006 ). In a comparative study of tap water, purified water, and bottled water, tap water was an essential source of gastrointestinal disease ( Payment et al., 1997 ). Lack of water and sanitation services also increases the incidence of diseases such as cholera, trachoma, schistosomiasis, and helminthiasis. Data from studies in developing countries show a clear relationship between cholera and contaminated water, and household water treatment and storage can reduce cholera ( Gundry et al., 2004 ). In addition to disease, unsafe drinking water, and poor environmental hygiene can lead to gastrointestinal illness, inhibiting nutrient absorption and malnutrition. These effects are especially pronounced for children.

Purpose of This Paper

More than two million people worldwide die each year from diarrhoeal diseases, with poor sanitation and unsafe drinking water being the leading cause of nearly 90% of deaths and affecting children the most (United Nations, 2016). More than 50 kinds of diseases are caused by poor drinking water quality, and 80% of diseases and 50% of child deaths are related to poor drinking water quality in the world. However, water pollution causes diarrhea, skin diseases, malnutrition, and even cancer and other diseases related to water pollution. Therefore, it is necessary to study the impact of water pollution on human health, especially disease heterogeneity, and clarify the importance of clean drinking water, which has important theoretical and practical significance for realizing sustainable development goals. Unfortunately, although many kinds of literature focus on water pollution and a particular disease, there is still a lack of research results that systematically analyze the impact of water pollution on human health and the heterogeneity of diseases. Based on the above background and discussion, this paper focuses on the effect of water pollution on human health and its disease heterogeneity.

Materials and Methods

Search process.

This article uses keywords such as “water,” “water pollution,” “water quality,” “health,” “diarrhea,” “skin disease,” “cancer” and “children” to search Web of Science and Google Scholar include SCI and SSCI indexed papers, research reports, and works from 1990 to 2021.

Inclusion-Exclusion Criteria and Data Extraction Process

The existing literature shows that water pollution and human health are important research topics in health economics, and scholars have conducted in-depth research. As of 30 December 2021, 104 related literatures were searched, including research papers, reviews and conference papers. Then, according to the content relevancy, 19 papers were eliminated, and 85 papers remained. The purpose of this review is to summarize the impact of water pollution on human health and its disease heterogeneity and to explore how to improve human health by improving water pollution control measures.

Information extracted from all included papers included: author, publication date, sample country, study methodology, study purpose, and key findings. All analysis results will be analyzed according to the process in Figure 1 .

FIGURE 1 . Data extraction process (PRISMA).

The relevant information of the paper is exported to the Excel database through Endnote, and the duplicates are deleted. The results were initially extracted by one researcher and then cross-checked by another researcher to ensure that all data had been filtered and reviewed. If two researchers have different opinions, the two researchers will review together until a final agreement is reached.

Quality Assessment of the Literature

The JBI Critical Appraisal Checklist was used to evaluate the quality of each paper. The JBI (Joanna Briggs Institute) key assessment tool was developed by the JBI Scientific Committee after extensive peer review and is designed for system review. All features of the study that meet the following eight criteria are included in the final summary:1) clear purpose; 2) Complete information of sample variables; 3) Data basis; 4) the validity of data sorting; 5) ethical norms; (6); 7) Effective results; 8) Apply appropriate quantitative methods and state the results clearly. Method quality is evaluated by the Yes/No questions listed in the JBI Key Assessment List. Each analysis paper received 6 out of 8.

The quality of drinking water is an essential factor affecting human health. Poor drinking water quality has led to the occurrence of water-borne diseases. According to the World Health Organization (WHO) survey, 80% of the world’s diseases and 50% of the world’s child deaths are related to poor drinking water quality, and there are more than 50 diseases caused by poor drinking water quality. The quality of drinking water in developing countries is worrying. The negative health effects of water pollution remain the leading cause of morbidity and mortality in developing countries. Different from the existing literature review, this paper mainly studies the impact of water pollution on human health according to the heterogeneity of diseases. We focuses on diarrhea, skin diseases, cancer, child health, etc., and sorts out the main effects of water pollution on human health ( Table 1 ).

TABLE 1 . Major studies on the relationship between water pollution and health.

Water Pollution and Diarrhea

Diarrhea is a common symptom of gastrointestinal diseases and the most common disease caused by water pollution. Diarrhea is a leading cause of illness and death in young children in low-income countries. Diarrhoeal diseases account for 21% of annual deaths among children under 5 years of age in developing countries ( Waddington et al., 2009 ). Many infectious agents associated with diarrhea are directly related to contaminated water ( Ahmed and Ismail, 2018 ). Parasitic worms present in non-purifying drinking water when is consumed by human beings causes diseases ( Ansari and Akhmatov., 2020 ) . It was found that treated water from water treatment facilities was associated with a lower risk of diarrhea than untreated water for all ages ( Clasen et al., 2015 ). For example, in the southern region of Brazil, a study found that factors significantly associated with an increased risk of mortality from diarrhoea included lack of plumbed water, lack of flush toilets, poor housing conditions, and overcrowded households. Households without access to piped water had a 4.8 times higher risk of infant death from diarrhea than households with access to piped water ( Victora et al., 1988 )

Enteroviruses exist in the aquatic environment. More than 100 pathogenic viruses are excreted in human and animal excreta and spread in the environment through groundwater, estuarine water, seawater, rivers, sewage treatment plants, insufficiently treated water, drinking water, and private wells ( Fong and Lipp., 2005 ). A study in Pakistan showed that coliform contamination was found in some water sources. Improper disposal of sewage and solid waste, excessive use of pesticides and fertilizers, and deteriorating pipeline networks are the main causes of drinking water pollution. The main source of water-borne diseases such as gastroenteritis, dysentery, diarrhea, and viral hepatitis in this area is the water pollution of coliform bacteria ( Khan et al., 2013 ). Therefore, the most important role of water and sanitation health interventions is to hinder the transmission of diarrheal pathogens from the environment to humans ( Waddington et al., 2009 ).

Meta-analyses are the most commonly used method for water quality and diarrhea studies. It was found that improving water supply and sanitation reduced the overall incidence of diarrhea by 26%. Among Malaysian infants, having clean water and sanitation was associated with an 82% reduction in infant mortality, especially among infants who were not breastfed ( Esrey et al., 1991 ). All water quality and sanitation interventions significantly reduced the risk of diarrhoeal disease, and water quality interventions were found to be more effective than previously thought. Multiple interventions (including water, sanitation, and sanitation measures) were not more effective than single-focus interventions ( Fewtrell and Colford., 2005 ). Water quality interventions reduced the risk of diarrhoea in children and reduced the risk of E. coli contamination of stored water ( Arnold and Colford., 2007 ). Interventions to improve water quality are generally effective in preventing diarrhoea in children of all ages and under 5. However, some trials showed significant heterogeneity, which may be due to the research methods and their conditions ( Clasen et al., 2007 ).

Water Pollution and Skin Diseases

Contrary to common sense that swimming is good for health, studies as early as the 1950s found that the overall disease incidence in the swimming group was significantly higher than that in the non-swimming group. The survey shows that the incidence of the disease in people under the age of 10 is about 100% higher than that of people over 10 years old. Skin diseases account for a certain proportion ( Stevenson, 1953 ). A prospective epidemiological study of beach water pollution was conducted in Hong Kong in the summer of 1986–1987. The study found that swimmers on Hong Kong’s coastal beaches were more likely than non-swimmers to complain of systemic ailments such as skin and eyes. And swimming in more polluted beach waters has a much higher risk of contracting skin diseases and other diseases. Swimming-related disease symptom rates correlated with beach cleanliness ( Cheung et al., 1990 ).

A study of arsenic-affected villages in the southern Sindh province of Pakistan emphasized that skin diseases were caused by excessive water quality. By studying the relationship between excessive arsenic in drinking water caused by water pollution and skin diseases (mainly melanosis and keratosis), it was found that compared with people who consumed urban low-arsenic drinking water, the hair of people who consumed high-arsenic drinking water arsenic concentration increased significantly. The level of arsenic in drinking water directly affects the health of local residents, and skin disease is the most common clinical complication of arsenic poisoning. There is a correlation between arsenic concentrations in biological samples (hair and blood) from patients with skin diseases and intake of arsenic-contaminated drinking water ( Kazi et al., 2009 ). Another Bangladesh study showed that many people suffer from scabies due to river pollution ( Hanif et al., 2020 ). Not only that, but water pollution from industry can also cause skin cancer ( Arif et al., 2020 ).

Studies using meta-analysis have shown that exposure to polluted Marine recreational waters can have adverse consequences, including frequent skin discomfort (such as rash or itching). Skin diseases in swimmers may be caused by a variety of pathogenic microorganisms ( Yau et al., 2009 ). People (swimmers and non-swimmers) exposed to waters above threshold levels of bacteria had a higher relative risk of developing skin disease, and levels of bacteria in seawater were highly correlated with skin symptoms.

Studies have also suggested that swimmers are 3.5 times more likely to report skin diseases than non-swimmers. This difference may be a “risk perception bias” at work on swimmers, who are generally aware that such exposure may lead to health effects and are more likely to detect and report skin disorders. It is also possible that swimmers exaggerated their symptoms, reporting conditions that others would not classify as true skin disorders ( Fleisher and Kay. 2006 ).

Water Pollution and Cancer

According to WHO statistics, the number of cancer patients diagnosed in 2020 reached 19.3 million, while the number of deaths from cancer increased to 10 million. Currently, one-fifth of all global fevers will develop cancer during their lifetime. The types and amounts of carcinogens present in drinking water will vary depending on where they enter: contamination of the water source, water treatment processes, or when the water is delivered to users ( Morris, 1995 ).

From the perspective of water sources, arsenic, nitrate, chromium, etc. are highly associated with cancer. Ingestion of arsenic from drinking water can cause skin cancer and kidney and bladder cancer ( Marmot et al., 2007 ). The risk of cancer in the population from arsenic in the United States water supply may be comparable to the risk from tobacco smoke and radon in the home environment. However, individual susceptibility to the carcinogenic effects of arsenic varies ( Smith et al., 1992 ). A high association of arsenic in drinking water with lung cancer was demonstrated in a northern Chilean controlled study involving patients diagnosed with lung cancer and a frequency-matched hospital between 1994 and 1996. Studies have also shown a synergistic effect of smoking and arsenic intake in drinking water in causing lung cancer ( Ferreccio et al., 2000 ). Exposure to high arsenic levels in drinking water was also associated with the development of liver cancer, but this effect was not significant at exposure levels below 0.64 mg/L ( Lin et al., 2013 ).

Nitrates are a broader contaminant that is more closely associated with human cancers, especially colorectal cancer. A study in East Azerbaijan confirmed a significant association between colorectal cancer and nitrate in men, but not in women (Maleki et al., 2021). The carcinogenic risk of nitrates is concentration-dependent. The risk increases significantly when drinking water levels exceed 3.87 mg/L, well below the current drinking water standard of 50 mg/L. Drinking water with nitrate concentrations lower than current drinking water standards also increases the risk of colorectal cancer ( Schullehner et al., 2018 ).

Drinking water with high chromium content will bring high carcinogenicity caused by hexavalent chromium to residents. Drinking water intake of hexavalent chromium experiments showed that hexavalent chromium has the potential to cause human respiratory cancer. ( Zhitkovich, 2011 ). A case from Changhua County, Taiwan also showed that high levels of chromium pollution were associated with gastric cancer incidence ( Tseng et al., 2018 ).

There is a correlation between trihalomethane (THM) levels in drinking water and cancer mortality. Bladder and brain cancers in both men and women and non-Hodgkin’s lymphoma and kidney cancer in men were positively correlated with THM levels, and bladder cancer mortality had the strongest and most consistent association with THM exposure index ( Cantor et al., 1978 ).

From the perspective of water treatment process, carcinogens may be introduced during chlorine treatment, and drinking water is associated with all cancers, urinary cancers and gastrointestinal cancers ( Page et al., 1976 ). Chlorinated byproducts from the use of chlorine in water treatment are associated with an increased risk of bladder and rectal cancer, with perhaps 5,000 cases of bladder and 8,000 cases of rectal cancer occurring each year in the United States (Morris, 1995).

The impact of drinking water pollutants on cancer is complex. Epidemiological studies have shown that drinking water contaminants, such as chlorinated by-products, nitrates, arsenic, and radionuclides, are associated with cancer in humans ( Cantor, 1997 ). Pb, U, F- and no3- are the main groundwater pollutants and one of the potential causes of cancer ( Kaur et al., 2021 ). In addition, many other water pollutants are also considered carcinogenic, including herbicides and pesticides, and fertilizers that contain and release nitrates ( Marmot et al., 2007 ). A case from Hebei, China showed that the contamination of nitrogen compounds in well water was closely related to the use of nitrogen fertilizers in agriculture, and the levels of three nitrogen compounds in well water were significantly positively correlated with esophageal cancer mortality ( Zhang et al., 2003 ).

In addition, due to the time-lag effect, the impact of watershed water pollution on cancer is spatially heterogeneous. The mortality rate of esophageal cancer caused by water pollution is significantly higher downstream than in other regions due to the impact of historical water pollution ( Xu et al., 2019 ). A study based on changes in water quality in the watershed showed that a grade 6 deterioration in water quality resulted in a 9.3% increase in deaths from digestive cancer. ( Ebenstein, 2012 ).

Water Pollution and Child Health

Diarrhea is a common disease in children. Diarrhoeal diseases (including cholera) kill 1.8 million people each year, 90 per cent of them children under the age of five, mostly in developing countries. 88% of diarrhoeal diseases are caused by inadequate water supply, sanitation and hygiene (Team, 2004). A large proportion of these are caused by exposure to microbially infected water and food, and diarrhea in infants and young children can lead to malnutrition and reduced immune resistance, thereby increasing the likelihood of prolonged and recurrent diarrhea ( Marino, 2007 ). Pollution exposure experienced by children during critical periods of development is associated with height loss in adulthood ( Zaveri et al., 2020 ). Diseases directly related to water and sanitation, combined with malnutrition, also lead to other causes of death, such as measles and pneumonia. Child malnutrition and stunting due to inadequate water and sanitation will continue to affect more than one-third of children in the world ( Bartlett, 2003 ). A study from rural India showed that children living in households with tap water had significantly lower disease prevalence and duration ( Jalan and Ravallion, 2003 ).

In conclusion, water pollution is a significant cause of childhood diseases. Air, water, and soil pollution together killed 940,000 children worldwide in 2016, two-thirds of whom were under the age of 5, and the vast majority occurred in low- and middle-income countries ( Landrigan et al., 2018 ). The intensity of industrial organic water pollution is positively correlated with infant mortality and child mortality in less developed countries, and industrial water pollution is an important cause of infant and child mortality in less developed countries ( Jorgenson, 2009 ). In addition, arsenic in drinking water is a potential carcinogenic risk in children (García-Rico et al., 2018). Nitrate contamination in drinking water may cause goiter in children ( Vladeva et al.., 2000 ).

Discussions

This paper reviews the environmental science, health, and medical literature, with a particular focus on epidemiological studies linking water quality, water pollution, and human disease, as well as studies on water-related disease morbidity and mortality. At the same time, special attention is paid to publications from the United Nations and the World Health Organization on water and sanitation health research. The purpose of this paper is to clarify the relationship between water pollution and human health, including: The relationship between water pollution and diarrhea, the mechanism of action, and the research situation of meta-analysis; The relationship between water pollution and skin diseases, pathogenic factors, and meta-analysis research; The relationship between water pollution and cancer, carcinogenic factors, and types of cancer; The relationship between water pollution and Child health, and the major childhood diseases caused.

A study of more than 100 literatures found that although factors such as country, region, age, and gender may have different influences, in general, water pollution has a huge impact on human health. Water pollution is the cause of many human diseases, mainly diarrhoea, skin diseases, cancer and various childhood diseases. The impact of water pollution on different diseases is mainly reflected in the following aspects. Firstly, diarrhea is the most easily caused disease by water pollution, mainly transmitted by enterovirus existing in the aquatic environment. The transmission environment of enterovirus depends on includes groundwater, river, seawater, sewage, drinking water, etc. Therefore, it is necessary to prevent the transmission of enterovirus from the environment to people through drinking water intervention. Secondly, exposure to or use of heavily polluted water is associated with a risk of skin diseases. Excessive bacteria in seawater and heavy metals in drinking water are the main pathogenic factors of skin diseases. Thirdly, water pollution can pose health risks to humans through any of the three links: the source of water, the treatment of water, and the delivery of water. Arsenic, nitrate, chromium, and trihalomethane are major carcinogens in water sources. Carcinogens may be introduced during chlorine treatment from water treatment. The effects of drinking water pollution on cancer are complex, including chlorinated by-products, heavy metals, radionuclides, herbicides and pesticides left in water, etc., Finally, water pollution is an important cause of children’s diseases. Contact with microbiologically infected water can cause diarrhoeal disease in children. Malnutrition and weakened immunity from diarrhoeal diseases can lead to other diseases.

This study systematically analyzed the impact of water pollution on human health and the heterogeneity of diseases from the perspective of different diseases, focusing on a detailed review of the relationship, mechanism and influencing factors of water pollution and diseases. From the point of view of limitations, this paper mainly focuses on the research of environmental science and environmental management, and the research on pathology is less involved. Based on this, future research can strengthen research at medical and pathological levels.

In response to the above research conclusions, countries, especially developing countries, need to adopt corresponding water management policies to reduce the harm caused by water pollution to human health. Firstly, there is a focus on water quality at the point of use, with interventions to improve water quality, including chlorination and safe storage ( Gundry et al., 2004 ), and provision of treated and clean water ( Khan et al., 2013 ). Secondly, in order to reduce the impact of water pollution on skin diseases, countries should conduct epidemiological studies on their own in order to formulate health-friendly bathing water quality standards suitable for their specific conditions ( Cheung et al., 1990 ). Thirdly, in order to reduce the cancer caused by water pollution, the whole-process supervision of water quality should be strengthened, that is, the purity of water sources, the scientific nature of water treatment and the effectiveness of drinking water monitoring. Fourthly, each society should prevent and control source pollution from production, consumption, and transportation ( Landrigan et al., 2018 ). Fifthly, health education is widely carried out. Introduce environmental education, educate residents on sanitary water through newspapers, magazines, television, Internet and other media, and enhance public health awareness. Train farmers to avoid overuse of agricultural chemicals that contaminate drinking water.

Author Contributions

Conceptualization, XX|; methodology, LL; data curation, HY; writing and editing, LL; project administration, XX|.

This article is a phased achievement of The National Social Science Fund of China: Research on the blocking mechanism of the critical poor households returning to poverty due to illness, No: 20BJY057.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s Note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Keywords: water pollution, human health, disease heterogeneity, water intervention, health cost

Citation: Lin L, Yang H and Xu X (2022) Effects of Water Pollution on Human Health and Disease Heterogeneity: A Review. Front. Environ. Sci. 10:880246. doi: 10.3389/fenvs.2022.880246

Received: 21 February 2022; Accepted: 09 June 2022; Published: 30 June 2022.

Reviewed by:

Copyright © 2022 Lin, Yang and Xu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Xiaocang Xu, [email protected]

This article is part of the Research Topic

Bioaerosol Emission Characteristics and the Epidemiological, Occupational, and Public Health Risk Assessment of Waste and Wastewater Management

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Effects of air pollution on human health and practical measures for prevention in Iran

Adel ghorani-azam.

Medical Toxicology Research Center, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran

Bamdad Riahi-Zanjani

Mahdi balali-mood.

Air pollution is a major concern of new civilized world, which has a serious toxicological impact on human health and the environment. It has a number of different emission sources, but motor vehicles and industrial processes contribute the major part of air pollution. According to the World Health Organization, six major air pollutants include particle pollution, ground-level ozone, carbon monoxide, sulfur oxides, nitrogen oxides, and lead. Long and short term exposure to air suspended toxicants has a different toxicological impact on human including respiratory and cardiovascular diseases, neuropsychiatric complications, the eyes irritation, skin diseases, and long-term chronic diseases such as cancer. Several reports have revealed the direct association between exposure to the poor air quality and increasing rate of morbidity and mortality mostly due to cardiovascular and respiratory diseases. Air pollution is considered as the major environmental risk factor in the incidence and progression of some diseases such as asthma, lung cancer, ventricular hypertrophy, Alzheimer's and Parkinson's diseases, psychological complications, autism, retinopathy, fetal growth, and low birth weight. In this review article, we aimed to discuss toxicology of major air pollutants, sources of emission, and their impact on human health. We have also proposed practical measures to reduce air pollution in Iran.

INTRODUCTION

Air pollution is a major problem of recent decades, which has a serious toxicological impact on human health and the environment. The sources of pollution vary from small unit of cigarettes and natural sources such as volcanic activities to large volume of emission from motor engines of automobiles and industrial activities.[ 1 , 2 ] Long-term effects of air pollution on the onset of diseases such as respiratory infections and inflammations, cardiovascular dysfunctions, and cancer is widely accepted;[ 3 , 4 , 5 , 6 ] hence, air pollution is linked with millions of death globally each year.[ 7 , 8 , 9 ] A recent study has revealed the association between male infertility and air pollution.[ 10 ]

Air pollution has now emerged in developing countries as a result of industrial activities and also increase the quantity of emission sources such as inappropriate vehicles.[ 11 , 12 , 13 ] About 4.3 million people die from household air pollution and 3.7 million from ambient air pollution, most of whom (3.3 and 2.6 million, respectively) live in Asia.[ 14 ] In Iran, as a developing country, the level of air pollutants has increased gradually since the beginning of industrialization in the 1970s, but it has reached a very harmful level in some megacities such as Tehran, Mashhad, Tabriz, Isfahan, Ahvaz, Arak, and Karaj over the past two decades. Iran is the world's third main polluted country in the world, which results in 16 billion $ annual loss.[ 15 ] In fact, four of the top ten air-polluted cities are in Iran. Ahvaz is the most air polluted city in the world with microdust blowing in from neighboring countries, and particulate levels three times that of Beijing, and nearly 13 times that of London.[ 16 ] Air pollution caused almost 4460 deaths in 2013 only in Tehran although the reality seemed higher and is getting worse every year.[ 17 ] Therefore, it is of great importance to describe the problem, particularly its toxic effects on human health and provide recommendations as a basis for environmental guidelines and standard protocols in the field of air pollution in Iran.

The present article is neither a systematic review nor a descriptive, educational study. It is a problem-based descriptive review in which the authors try to explain a problem which is the major health and ecological problem in developing countries like Iran. In this review, we have tried to summarize the toxicology of air pollutants and related diseases with a possible mechanism of action and appropriate management of the patients. Therefore, it shall be useful for the environmental and health professionals particularly policy makers, emergency physicians, and other clinicians who may be involved in air pollution and related diseases. In this paper, we also discuss sources of air pollution and proposed some feasible solutions which may be beneficial for the environmental legislators and decision makers.

DEFINITIONS

Air pollution is defined as all destructive effects of any sources which contribute to the pollution of the atmosphere and/or deterioration of the ecosystem. Air pollution is caused by both human interventions and/or natural phenomena. It is made up of many kinds of pollutants including materials in solid, liquid, and gas phases.[ 18 ] Air pollutions of indoors will not be specifically considered in this article.

The Pollutant Standard Index (PSI) is a numerical value and indicator of pollutants that is normally used to facilitate risk assessment. It is a numeric value between zero to 500.[ 19 ] PSI is a guideline for reporting air quality which was first introduced by Thom and Ott in 1974.[ 20 ] Hence, it would provide a method of comparing the relative contribution of each pollutant to total risk.[ 21 ] The calculation of PSI is based on the concentration of five major air pollutants including particulate matters (PMs), sulfur dioxide (SO 2 ), nitrogen dioxide (NO 2 ), carbon monoxide (CO), and ozone (O 3 ) in the air.

According to Johnson et al ., “air quality index (AQI) is defined as a measure of the condition of air relative to the requirements of one or more biotic species or to any human need.”[ 22 ] AQI is divided into ranges, in which they are numbered, and each range is marked with color codes. It provides a number from healthy standard level of zero to a very hazardous level of above 300 to indicate the level of health risk associated with air quality. Based on PSI, air quality is classified into six major indices, which is marked by color codes and each color corresponds to a different level of health concerns. Principally, green is defined as a color indicator for healthy air quality; while yellow, orange, red, purple, and maroon colors indicate as moderate, unhealthy for sensitive groups, unhealthy, very unhealthy, and hazardous air quality, respectively. These ranges and codes may differ in the different methods of classifications in different countries.[ 22 ]

TOXICOLOGY OF AIR POLLUTION

Effects of air pollutants on living organism will not only be limited to the human and animal health but also include the whole environment. Different geographical conditions, global climate changes, and the environmental variations affect the human health and the environment including the animal life.

Environmental damages

Ecologically, air pollution can cause serious environmental damages to the groundwater, soil, and air.[ 23 , 24 ] It is also a serious threat to the diversity of life. Studies on the relationship between air pollution and reducing species diversity clearly show the detrimental effects of environmental contaminants on the extinction of animals and plants species.[ 25 ] Air suspended toxicants may also cause reproductive effects in animals.[ 26 , 27 ] Acid rain, temperature inversion, and global climate changes due to the emissions of greenhouse gasses to the atmosphere are other major ecological impacts of air pollution.[ 28 ]

Air pollutants and their toxicities

Every material in the air which could affect human health or have a profound impact on the environment is defined as air pollutants. According to the World Health Organization (WHO), particle pollution, ground-level O 3 , CO, sulfur oxides, nitrogen oxides, and lead (Pb) are the six major air pollutants which harm human health and also the ecosystem. There are many pollutants of suspended materials such as dust, fumes, smokes, mists, gaseous pollutants, hydrocarbons, volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), and halogen derivatives in the air which at the high concentrations cause vulnerability to many diseases including different types of cancers.[ 29 , 30 , 31 , 32 ] The most important air pollutants and their toxic effects on different human body organs and related diseases have been briefly described below.

Particle pollutants

Particle pollutants are major parts of air pollutants. In a simple definition, they are a mixture of particles found in the air. Particle pollution which is more known as PM is linked with most of pulmonary and cardiac-associated morbidity and mortality.[ 33 , 34 ] They have varied in size ranging mostly from 2.5 to 10 μm (PM 2.5 to PM 10 ).

The size of particle pollutants is directly associated with the onset and progression of the lungs and heart diseases. Particles of smaller size reach the lower respiratory tract and thus have greater potential for causing the lungs and heart diseases. Moreover, numerous scientific data have demonstrated that fine particle pollutants cause premature death in people with heart and/or lung disease including cardiac dysrhythmias, nonfatal heart attacks, aggravated asthma, and decreased lung functions. Depending on the level of exposure, particulate pollutants may cause mild to severe illnesses. Wheezing, cough, dry mouth, and limitation in activities due to breathing problems are the most prevalent clinical symptoms of respiratory disease resulted from air pollution.[ 35 , 36 , 37 ]

Long-term exposure to current ambient PM concentrations may lead to a marked reduction in life expectancy. The increase of cardiopulmonary and lung cancer mortality are the main reasons for the reduction in life expectancy. Reduced lung functions in children and adults leading to asthmatic bronchitis and chronic obstructive pulmonary disease (COPD) are also serious diseases which induce lower quality of life and reduced life expectancy. Strong evidence on the effect of long-term exposure to PM on cardiovascular and cardiopulmonary mortality come from cohort studies.[ 38 , 39 , 40 ]

Ground-level ozone

O 3 with the chemical formula of O 3 is a colorless gas which is the major constituent of the atmosphere. It is found both at the ground level and in the upper regions of the atmosphere which is called troposphere. Ground-level ozone (GLO) is produced as a result of chemical reaction between oxides of nitrogen and VOCs emitted from natural sources and/or due to human activities. GLO is believed to have a plausible association with increased risk of respiratory diseases, particularly asthma.[ 41 ]

As a powerful oxidant, O 3 accepts electrons from other molecules. There is a high level of polyunsaturated fatty acids in the surface fluid lining of the respiratory tract and cell membranes that underlie the lining fluid. The double bonds available in these fatty acids are unstable. O 3 attacks unpaired electron to form ozonides and progress through an unstable zwitterion or trioxolane (depending on the presence of water). These ultimately recombine or decompose to lipohydroperoxides, aldehydes, and hydrogen peroxide. These pathways are thought to initiate propagation of lipid radicals and auto-oxidation of cell membranes and macromolecules. It also increases the risk of DNA damage in epidermal keratinocytes, which leads to impaired cellular function.[ 42 ]

O 3 induces a variety of toxic effects in humans and experimental animals at concentrations that occur in many urban areas.[ 43 ] These effects include morphologic, functional, immunologic, and biochemical alterations. Because of its low water solubility, a substantial portion of inhaled O 3 penetrates deep into the lungs but its reactivity is scrubbed by the nasopharynx of resting rats and humans in around 17% and 40%, respectively.[ 44 , 45 ] On ecological aspect, O 3 can reduce carbon assimilation in trees leading to deforestation which may affect global food security in long-term exposure.[ 46 , 47 ]

Carbon monoxide

CO is a colorless and odorless gas, which is produced by fossil fuel, particularly when combustion is not appropriate, as in burning coal and wood. The affinity of CO to hemoglobin (as an oxygen carrier in the body) is about 250 times greater than that of oxygen. Depending on CO concentration and length of exposure, mild to severe poisoning may occur. Symptoms of CO poisoning may include headache, dizziness, weakness, nausea, vomiting, and finally loss of consciousness. The symptoms are very similar to those of other illnesses, such as food poisoning or viral infections.

No human health effects have been showed for carboxyhemoglobin (COHb) levels lower than 2%, while levels above 40% may be fatal. Hypoxia, apoptosis, and ischemia are known mechanisms of underlying CO toxicity.[ 48 ] The mechanism of such toxicity is the loss of oxygen due to competitive binding of CO to the hemoglobin heme groups. Cardiovascular changes also may be observed by CO exposures that create COHb in excess of 5%. In the early 1990s, Health Effects Institute performed a series of studies associated with cardiovascular disease to determine the potential for angina pectoris with COHb levels in the range of 2–6%.[ 49 ] The results showed that premature angina can occur under these situations but that the potential for the occurrence of ventricular arrhythmias remains uncertain. Thus, the reduction in ambient CO can reduce the risk of myocardial infarction in predisposed persons.

Sulfur dioxide

SO 2 is a colorless, highly reactive gas, which is considered as an important air pollutant. It is mostly emitted from fossil fuel consumption, natural volcanic activities, and industrial processes. SO 2 is very harmful for plant life, animal, and human health. People with lung disease, children, older people, and those who are more exposed to SO 2 are at higher risk of the skin and lung diseases.

The major health concerns associated with exposure to high concentrations of SO 2 include respiratory irritation and dysfunction, and also aggravation of existing cardiovascular disease. SO 2 is predominantly absorbed in the upper airways. As a sensory irritant, it can cause bronchospasm and mucus secretion in humans. Residents of industrialized regions encountered with SO 2 even at lower concentrations (<1 ppm) in the polluted ambient air might experience a high level of bronchitis.

The penetration of SO 2 into the lungs is greater during mouth breathing compared to nose breathing. An increase in the airflow in deep, rapid breathing enhances penetration of the gas into the deeper lung. Therefore, people who exercise in the polluted air would inhale more SO 2 and are likely to suffer from greater irritation. When SO 2 deposits along the airway, it dissolves into surface lining fluid as sulfite or bisulfite and is easily distributed throughout the body. It seems that the sulfite interacts with sensory receptors in the airways to cause local and centrally mediated bronchoconstriction.

According to the Environmental Protection Agency (EPA) of the USA, the level of annual standard for SO 2 is 0.03 ppm. Due to its solubility in water, SO 2 is responsible for acid rain formation and acidification of soils. SO 2 reduces the amount of oxygen in the water causing the death of marine species including both animals and plants. Exposure to SO 2 can cause damages to the eyes (lacrimation and corneal opacity), mucous membranes, the skin (redness, and blisters), and respiratory tracts. Bronchospasm, pulmonary edema, pneumonitis, and acute airway obstruction are the most common clinical findings associated with exposure to SO 2 .[ 50 ]

Nitrogen oxide

Nitrogen oxides are important ambient air pollutants which may increase the risk of respiratory infections.[ 50 ] They are mainly emitted from motor engines and thus are traffic-related air pollutants. They are deep lung irritants that can induce pulmonary edema if been inhaled at high levels. They are generally less toxic than O 3 , but NO 2 can pose clear toxicological problems. Exposures at 2.0–5.0 ppm have been shown to affect T-lymphocytes, particularly CD8 + cells and natural killer cells that play an important role in host defenses against viruses. Although these levels may be high, epidemiologic studies demonstrate effects of NO 2 on respiratory infection rates in children.

Coughing and wheezing are the most common complication of nitrogen oxides toxicity, but the eyes, nose or throat irritations, headache, dyspnea, chest pain, diaphoresis, fever, bronchospasm, and pulmonary edema may also occur. In another report, it is suggested that the level of nitrogen oxide between 0.2 and 0.6 ppm is harmless for the human population.[ 51 ]

Pb or plumb is a toxic heavy metal that is widely used in different industries.[ 52 ] Pb pollution may result from both indoor and outdoor sources. It is emitted from motor engines, particularly with those using petrol containing Pb tetraethyl. Smelters and battery plants, as well as irrigation water wells and wastewaters, are other emission sources of the Pb into the environment.[ 52 , 53 ] Evaluation of the blood Pb level in traffic police officers shows that environmental pollution may be considered as a source of Pb exposure.[ 54 ] Fetuses and children are highly susceptible to even low doses of Pb.[ 55 ] Pb accumulates in the body in blood, bone, and soft tissue. Because it is not readily excreted, Pb can also affect the kidneys, liver, nervous system, and the other organs.[ 56 ]

Pb absorption by the lungs depends on the particle size and concentration. Around 90% of Pb particles in the ambient air that are inhaled are small enough to be retained. Retained Pb absorption through alveoli is absorbed and induces toxicity. Pb is a powerful neurotoxicant, especially for infants and children as the high-risk groups. Mental retardation, learning disabilities, impairment of memory, hyperactivity, and antisocial behaviors are of adverse effects of Pb in childhood.[ 57 , 58 ] Therefore, it is very important to reduce the Pb level of ambient air.[ 59 ]

Pb exposure is often chronic, without obvious symptoms.[ 60 ] It can affect the different parts of the body including cardiovascular, renal, and reproductive systems, but the main target for Pb toxicity is the nervous system.[ 61 ] Pb disrupts the normal function of intracellular second messenger systems through the inhibition of N-methyl-D-aspartate receptors. Pb may also replace calcium as a second messenger resulting in protein modification through various cellular processes including protein kinase activation or deactivation.

Abdominal pain, anemia, aggression, constipation, headaches, irritability, loss of concentration and memory, reduced sensations, and sleep disorders are the most common symptoms of Pb poisoning. Exposure to Pb is manifested with numerous problems, such as high blood pressure, infertility, digestive and renal dysfunctions, and muscle and joint pain.

Other air pollutants

Other major air pollutants that are classified as carcinogen and mutagen compounds and are thought to be responsible for incidence and progression of cancer in human include VOCs such as benzene, toluene, ethylbenzene, and xylene, PAHs such as acenaphthene, acenaphthylene, anthracene, and benzopyrene, and other organic pollutants such as dioxins, which are unwanted chemical pollutants that almost totally produced by industrial processes and human activity.[ 62 , 63 , 64 ]

In Table 1 , the standard level of some conventional air pollutants is presented in which the values were defined as air quality standards that provide public welfare protection.

Standard level of criteria air pollutants and their sources with health impact based on the United States Environmental Protection Agency

As it can be easily understood, fossil fuel consumption shares the largest part of air contamination. Air pollutants can also be classified into anthropogenic and natural according to their source of emission. From anthropogenic aspect, air contamination occurs from industrial and agricultural activities, transportation, and energy acquisition. While from natural contaminant has different sources of emission such as volcanic activities, forest fire, sea water, and so on.[ 65 , 66 ]

Health hazards

In terms of health hazards, every unusual suspended material in the air, which causes difficulties in normal function of the human organs, is defined as air toxicants. According to available data, the main toxic effects of exposure to air pollutants are mainly on the respiratory, cardiovascular, ophthalmologic, dermatologic, neuropsychiatric, hematologic, immunologic, and reproductive systems. However, the molecular and cell toxicity may also induce a variety of cancers in the long term.[ 67 , 68 ] On the other hand, even small amount of air toxicants is shown to be dangerous for susceptible groups including children and elderly people as well as patients suffering from respiratory and cardiovascular diseases.[ 69 ]

Respiratory disorders

Because most of the pollutants enter the body through the airways, the respiratory system is in the first line of battle in the onset and progression of diseases resulted from air pollutants. Depending on the dose of inhaled pollutants, and deposition in target cells, they cause a different level of damages in the respiratory system. In the upper respiratory tract, the first effect is irritation, especially in trachea which induces voice disturbances. Air pollution is also considered as the major environmental risk factor for some respiratory diseases such as asthma and lung cancer.[ 70 , 71 ] Air pollutants, especially PMs and other respirable chemicals such as dust, O 3 , and benzene cause serious damage to the respiratory tract.[ 72 , 73 , 74 , 75 , 76 , 77 ] Asthma is a respiratory disease which may be developed as a result of exposure to air toxicants.[ 78 ] Some studies have validated associations between both traffic-related and/or industrial air pollution and increasing the risk of COPD.[ 79 , 80 , 81 ] Treatment of respiratory diseases due to air pollution is similar to the other toxic chemical induce respiratory disorders.

Cardiovascular dysfunctions

Many experimental and epidemiologic studies have shown the direct association of air pollutant exposure and cardiac-related illnesses.[ 82 , 83 , 84 , 85 ] Air pollution is also associated with changes in white blood cell counts[ 86 ] which also may affect the cardiovascular functions. On the other hand, a study on animal models suggested the close relationship between hypertension and air pollution exposure.[ 87 ] The traffic-related air pollution, especially exposure to high levels of NO 2 , is associated with right and left ventricular hypertrophy.[ 88 , 89 ] In addition to the antidote therapy that exists only for a few cardiotoxic substances like CO, usual treatment of cardiovascular diseases should be carried out.

Neuropsychiatric complications

The relationship between exposure to air suspended toxic materials and nerve system has always been argued. However, it is now believed that these toxic substances have damaging effects on the nervous system. The toxic effect of air pollutants on nerve system includes neurological complications and psychiatric disorders. Neurological impairment may cause devastating consequences, especially in infants. In contrast, psychiatric disorders will induce aggression and antisocial behaviors. Recent studies have reported the relationship between air pollution and neurobehavioral hyperactivity, criminal activity, and age-inappropriate behaviors.[ 90 , 91 ] Studies have also revealed the association between air pollution and higher risk of neuroinflammation,[ 92 ] Alzheimer's and Parkinson's diseases.[ 93 ] Some studies showed that aggression and anxiety in megacities are in close relationship with the high level of air pollutants.[ 94 , 95 , 96 ]

Other long-term complications

Skin is the body's first line of defense against a foreign pathogen or infectious agent and it is the first organ that may be contaminated by a pollutant. The skin is a target organ for pollution in which the absorption of environmental pollutants from this organ is equivalent to the respiratory uptake.[ 97 ] Research on the skin has provided evidence that traffic-related air pollutants, especially PAHs, VOCs, oxides, and PM affect skin aging and cause pigmented spots on the face.[ 98 , 99 , 100 ]

Theoretically, toxic air pollutants can cause damage to organs when inhaled or absorbed through the skin.[ 101 ] Some of these pollutants are hepatocarcinogen chemicals.[ 102 , 103 ] There are some proven data which highlighted the role of air pollutants, especially traffic-related air pollution on the incidence of autism and its related disorders in fetus and children.[ 104 , 105 , 106 , 107 ] Disrupting endocrine by chemical components of pollutants has been described as a possible mechanistic pathway of autism or other neurological disorders.[ 93 , 108 ] Some studies showed that there are relationships between air pollution exposure and fetal head size in late pregnancy,[ 109 ] fetal growth,[ 110 ] and low birth weight.[ 111 , 112 ]

Many of the diseases that are linked to immune system dysfunction can be affected by several environmental factors such as poor air quality.[ 113 , 114 ] Poor air quality can cause serious complications in the immune system such as an abnormal increase in the serum levels of the immunoglobulin (Ig); IgA, IgM, and the complement component C 3 in humans as well as chronic inflammatory diseases of the respiratory system.[ 115 ] Exposure to these immunotoxicants may also cause immune dysfunction at different stages which can serve as the basis for increased risks of numerous diseases such as neuroinflammation, an altered brain innate immune response.[ 93 , 116 ] Air pollutants modify antigen presentation by up-regulation of costimulatory molecules such as CD80 and CD86 on macrophages.[ 117 ]

The eye is a neglected vulnerable organ to the adverse effects of air suspended contaminants even household air pollution.[ 118 , 119 ] Clinical effects of air pollution on the eyes can vary from asymptomatic eye problems to dry eye syndrome. Chronic exposure to air pollutants increases the risk for retinopathy and adverse ocular outcomes. In addition, there are now evidence suggesting the association between air pollution and irritation of the eyes, dry eye syndrome, and some of the major blinding.[ 118 , 120 ] According to data, the level of air pollution is linked to short-term increases in the number of people visiting the ophthalmological emergency department.[ 121 , 122 ]

Air pollution in Iran

Air pollution in Iran as a developing country has recently caused several health and environmental problem. According to a report, the quality of air in Iran, especially in Tehran metropolis is very unhealthy and most of the pollution indices, specifically indices for CO and PM are above the standard and at sometimes at dangerous level.[ 123 ] Nonstandard motor engines and other traffic-related sources of air pollution are the most important cause of poor air quality. For example, more than 90% of the CO gas as an important air pollutant is generated by motor vehicles in Tehran.[ 124 ] Moreover, reports have shown that more than 80% of air pollution in Iran is attributed to motor vehicles.[ 125 , 126 ] Official reports show that in Tehran, 9.4% of the cars, 22.1% of vans, and 4.7% of taxis are carburetor vehicles. Around 9% of the vehicles in Tehran are responsible for the production of almost 400 tons pollutants annually.[ 127 ] Other reports demonstrated that cars are responsible for 80% of air pollution. Unpublished data show that a motorcycle produces air pollution 60 times more than a standard car. Based on reports, annual average of air toxicants including PM 10, SO 2 , NO 2 and O 3 in Tehran capital city of Iran with around 8.3 million inhabitants were 90.58, 89.16, 85, and 68.82 μg/m 3 , respectively. These values are more than standards defined by EPA and WHO. Therefore, as expected, air pollution is the main casualty of excess 2194 out of total 47284 deaths in a year. According to a recent report, SO 2 , NO 2 , and O 3 , respectively, have caused about additional 1458, 1050, and 819 cases of total mortality in 2011.[ 128 ] According to an official report in 2013, air pollution leaves almost 4,460 deaths annually only in Tehran.[ 129 ]

Reports of the World Bank in 2005 show that mortality due to urban air pollution in Iran has led to about 640 million dollars annual losses which contribute to 0.57% of the gross domestic product.[ 130 ] Another report has also shown that Iran is the world's third main polluted country in the world, which results in 16 billion $ annual loss for the country.[ 16 ] Many regulatory programs including planting projects have been developed to reduce urban air pollution in Iran, but due to lack of enough stewardship and standardization of new technologies including those related to car engines and also nonstandard energy production, no significant output has been obtained so far.[ 17 ]

Practical measures to reduce air pollution in Iran

The industrialization of societies is necessary to develop, but a long-term health problem and ecological impacts of such growth should always be considered prior to imposing a large financial burden on the societies. Therefore, it is suggested to adopt a balance between economic development and air pollution by legislating policies to control all activities resulting in air pollution.[ 131 , 132 , 133 ] There are some temporary but not trustworthy strategies to reduce air pollution in Iran. For example, increasing the price of fuels, planting trees around and inside the city, replacing old cars with modern ones, and increasing road taxes and car insurance may reduce the amount of air pollutants, but in order to keep the constancy or even optimization, these strategies should be continued. The most air-polluted capital cities of Asia are Delhi and Tehran.[ 134 ] Causes of air pollutions including cheap and low quality of vehicle's fuel particularly gas oil, nonstandard motor engines, inappropriate public transport, overuse of fossil fuel, lack of public awareness and transparency, legislation, and cooperation between different departments and green societies are similar in the two cities. Therefore, urgent and concerted actions at national and international levels are required.

Some mega capital cities in the other countries like London and Tokyo have controlled their air pollutions over the years following appropriate legislations and strict controls, whereas moving the capital cities in India and Pakistan in the last century have not solved the problem of air pollution in the long term in these countries. Therefore, moving capital city will not solve the problem of air pollution and only reduces the problem in the short term. Some recommended strategies to reduce the air pollution in Iran are summarized as the followings:

• Standardization of vehicle's fuel as much as possible and also finding a new source of energy for motor engines has attracted great attention. A great part of emission comes from vehicle exhaust, especially those which use diesel and gasoline. Using other clean source of energy such as compressed natural gas (CNG), liquefied natural gas (LNG), and alcohol is of great interests. Hence, exhorting researchers and also companies in the era of interest to find a way for replacing petrol and other fossil fuels with new suitable power generation sources will be beneficial.[ 135 , 136 ] Expanded of more CNG and LNG stations in big cities of Iran and producing more vehicles using CNG and LNG are recommended
• Standardization of motor engines and manufacturing engines with low fuel consumption is another strategy to reduce the level of air pollutants. Surely, motor vehicles will not use fossil fuel and derivatives anymore in the near future. Recently, some car makers in Japan and Western countries have made electrical cars that use electricity from a battery storage for low speeds which is usually enough for driving inside the cities with traffic and/or controlled speeds. Hence, designing new motor engines, companies of interests should look forward.[ 137 ] This might be implemented in Iran in the future
• Improving public transportation systems by using more subways (metro), trams, and electrical bus routes. Reducing the costs for the people who are using such systems is an optimal solution for lowering air pollution.[ 14 ] The people and governments will gain profits from reducing air contaminations in the long term, both economically and in cases of health issues.[ 138 , 139 , 140 ] At the present, there are only limited metro lines in Tehran, Mashhad, and Esfahan. It is recommended to expand the metro lines in these cities. Trams and electrical buses have unfortunately not been established in Iran. They should be implemented soon in big cities of Iran
• Increasing the cost of fuel in Iran can be considered as an effective solution to reduce the proportion of air contaminants. According to the report by Barnett and Knibbs, higher fuel price is associated with lower air pollution level[ 141 ]
• Imposing penalties for polluting industries and implementing low tax policy for clean technologies. Applying more taxes on automobiles in Iran, particularly on those older than 20 years to distinguish between dirty and clean vehicles. The government should establish exhorting plans for car makers and other producers who adhere to environmental standards. Moreover, exhorting plans should be designed for all sources of emissions. These plans may contain discount on taxes or other financial supports for customers and producers
• Since the phenomenon of air pollution was a global issue over the centuries since the industrial revolution, it is proposed to establish an interdisciplinary academic field on air pollution. It is also suggested that more communication and collaboration between specialists in different sciences including toxicology, environmental health, analytical chemistry, mechanics, and applied physics will be performed
• Continuous monitoring of air quality, designing and developing tools to identify the pollutants, finding the origin of the particles, and the use of particulate filter for diesel engines and other nonroad cars are other suggested practical approaches to reduce air pollution
• Extensive media campaign to increase public awareness about air quality, environmental, and public health issues.

Inadequate legislation and also a lack of appropriate policies in Iran result in higher levels of environmental pollution and its impact on the incidence of diseases, which will undeniably impose a heavy financial burden on the community. Increasing risk of diseases due to air contamination has necessitated defining the standard values for air quality and also a normal range for pollutants and daily control of air pollution. Thus, monitoring air quality plays an important role in developing regulatory policies.[ 142 ] These should be implemented in all big cities of Iran.

Regulatory programs should apply high taxes per unit of emission not only as a penalty for air polluters but also should give rise to the cost of pollution for them in order to ensure the efficient reduction of pollutants. Final achievement is to reduce the pollution and not only paying the cost of damages by polluters.[ 143 ]

Advantages and breakpoints of these strategies should be carefully documented. Tax on vehicles is the most controversial issue in controlling and management of air pollution. It would be helpful providing all necessary facilities including subway, and other transportation systems prior to applying penalties. In other word, taxes should be applied, but public transportation systems should be improved, and also its cost should be reasonable enough.

It is important to balance between all suggested strategies, and discuss all aspects of each plan. Each of these controlling policies has an impact on each other and also on the society. Ideally, an optimum solution for the problem of air pollution is that in which no additional problem resulted from controlling policies impose on the society. Therefore, a suitable controlling policy should contain penalties for each unit of air pollutants’ emission. The sources of emission vary from small unit of cigarettes to large volume of emission from motor engines of automobiles and industrial activities.[ 144 ]

CONCLUSIONS AND RECOMMENDATIONS

Air pollutions have major impacts on human health, triggering, and inducing many diseases leading to high morbidities and mortalities, particularly in the developing countries such as Iran. Therefore, air pollutions control is vital and should be on the top of priority list of the governments. The policy makers and legislators in these countries must update all laws and regulations related to air pollutions. Coordination between different departments involving in air pollutions must be leaded by a powerful environmental protection organization. An effective environmental protection organization should have enough budgets for administration, research, development, monitoring, and full control of the environment including air pollution.

Financial support and sponsorship

Conflicts of interest.

The authors have no conflicts of interest.

AUTHORS’ CONTRIBUTIONS

AGA, BRZ, and MBM contributed in study concept, design, and critical revision of the manuscript. AGA and BRZ participated in the drafting of the manuscript. MBM contributed in revision and final approval of the manuscript.

Human Impacts on the Environment

Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water. These negative impacts can affect human behavior and can prompt mass migrations or battles over clean water.

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Causes and Effects of Climate Change

Fossil fuels – coal, oil and gas – are by far the largest contributor to global climate change, accounting for over 75 per cent of global greenhouse gas emissions and nearly 90 per cent of all carbon dioxide emissions.

As greenhouse gas emissions blanket the Earth, they trap the sun’s heat. This leads to global warming and climate change. The world is now warming faster than at any point in recorded history. Warmer temperatures over time are changing weather patterns and disrupting the usual balance of nature. This poses many risks to human beings and all other forms of life on Earth.

Causes of Climate Change

Generating power

Generating electricity and heat by burning fossil fuels causes a large chunk of global emissions. Most electricity is still generated by burning coal, oil, or gas, which produces carbon dioxide and nitrous oxide – powerful greenhouse gases that blanket the Earth and trap the sun’s heat. Globally, a bit more than a quarter of electricity comes from wind, solar and other renewable sources which, as opposed to fossil fuels, emit little to no greenhouse gases or pollutants into the air.

Manufacturing goods

Manufacturing and industry produce emissions, mostly from burning fossil fuels to produce energy for making things like cement, iron, steel, electronics, plastics, clothes, and other goods. Mining and other industrial processes also release gases, as does the construction industry. Machines used in the manufacturing process often run on coal, oil, or gas; and some materials, like plastics, are made from chemicals sourced from fossil fuels. The manufacturing industry is one of the largest contributors to greenhouse gas emissions worldwide.

Cutting down forests

Cutting down forests to create farms or pastures, or for other reasons, causes emissions, since trees, when they are cut, release the carbon they have been storing. Each year approximately 12 million hectares of forest are destroyed. Since forests absorb carbon dioxide, destroying them also limits nature’s ability to keep emissions out of the atmosphere. Deforestation, together with agriculture and other land use changes, is responsible for roughly a quarter of global greenhouse gas emissions.

Using transportation

Most cars, trucks, ships, and planes run on fossil fuels. That makes transportation a major contributor of greenhouse gases, especially carbon-dioxide emissions. Road vehicles account for the largest part, due to the combustion of petroleum-based products, like gasoline, in internal combustion engines. But emissions from ships and planes continue to grow. Transport accounts for nearly one quarter of global energy-related carbon-dioxide emissions. And trends point to a significant increase in energy use for transport over the coming years.

Producing food

Producing food causes emissions of carbon dioxide, methane, and other greenhouse gases in various ways, including through deforestation and clearing of land for agriculture and grazing, digestion by cows and sheep, the production and use of fertilizers and manure for growing crops, and the use of energy to run farm equipment or fishing boats, usually with fossil fuels. All this makes food production a major contributor to climate change. And greenhouse gas emissions also come from packaging and distributing food.

Powering buildings

Globally, residential and commercial buildings consume over half of all electricity. As they continue to draw on coal, oil, and natural gas for heating and cooling, they emit significant quantities of greenhouse gas emissions. Growing energy demand for heating and cooling, with rising air-conditioner ownership, as well as increased electricity consumption for lighting, appliances, and connected devices, has contributed to a rise in energy-related carbon-dioxide emissions from buildings in recent years.

Consuming too much

Your home and use of power, how you move around, what you eat and how much you throw away all contribute to greenhouse gas emissions. So does the consumption of goods such as clothing, electronics, and plastics. A large chunk of global greenhouse gas emissions are linked to private households. Our lifestyles have a profound impact on our planet. The wealthiest bear the greatest responsibility: the richest 1 per cent of the global population combined account for more greenhouse gas emissions than the poorest 50 per cent.

Based on various UN sources

Effects of Climate Change

Hotter temperatures

As greenhouse gas concentrations rise, so does the global surface temperature. The last decade, 2011-2020, is the warmest on record. Since the 1980s, each decade has been warmer than the previous one. Nearly all land areas are seeing more hot days and heat waves. Higher temperatures increase heat-related illnesses and make working outdoors more difficult. Wildfires start more easily and spread more rapidly when conditions are hotter. Temperatures in the Arctic have warmed at least twice as fast as the global average.

More severe storms

Destructive storms have become more intense and more frequent in many regions. As temperatures rise, more moisture evaporates, which exacerbates extreme rainfall and flooding, causing more destructive storms. The frequency and extent of tropical storms is also affected by the warming ocean. Cyclones, hurricanes, and typhoons feed on warm waters at the ocean surface. Such storms often destroy homes and communities, causing deaths and huge economic losses.

Increased drought

Climate change is changing water availability, making it scarcer in more regions. Global warming exacerbates water shortages in already water-stressed regions and is leading to an increased risk of agricultural droughts affecting crops, and ecological droughts increasing the vulnerability of ecosystems. Droughts can also stir destructive sand and dust storms that can move billions of tons of sand across continents. Deserts are expanding, reducing land for growing food. Many people now face the threat of not having enough water on a regular basis.

A warming, rising ocean

The ocean soaks up most of the heat from global warming. The rate at which the ocean is warming strongly increased over the past two decades, across all depths of the ocean. As the ocean warms, its volume increases since water expands as it gets warmer. Melting ice sheets also cause sea levels to rise, threatening coastal and island communities. In addition, the ocean absorbs carbon dioxide, keeping it from the atmosphere. But more carbon dioxide makes the ocean more acidic, which endangers marine life and coral reefs.

Loss of species

Climate change poses risks to the survival of species on land and in the ocean. These risks increase as temperatures climb. Exacerbated by climate change, the world is losing species at a rate 1,000 times greater than at any other time in recorded human history. One million species are at risk of becoming extinct within the next few decades. Forest fires, extreme weather, and invasive pests and diseases are among many threats related to climate change. Some species will be able to relocate and survive, but others will not.

Not enough food

Changes in the climate and increases in extreme weather events are among the reasons behind a global rise in hunger and poor nutrition. Fisheries, crops, and livestock may be destroyed or become less productive. With the ocean becoming more acidic, marine resources that feed billions of people are at risk. Changes in snow and ice cover in many Arctic regions have disrupted food supplies from herding, hunting, and fishing. Heat stress can diminish water and grasslands for grazing, causing declining crop yields and affecting livestock.

More health risks

Climate change is the single biggest health threat facing humanity. Climate impacts are already harming health, through air pollution, disease, extreme weather events, forced displacement, pressures on mental health, and increased hunger and poor nutrition in places where people cannot grow or find sufficient food. Every year, environmental factors take the lives of around 13 million people. Changing weather patterns are expanding diseases, and extreme weather events increase deaths and make it difficult for health care systems to keep up.

Poverty and displacement

Climate change increases the factors that put and keep people in poverty. Floods may sweep away urban slums, destroying homes and livelihoods. Heat can make it difficult to work in outdoor jobs. Water scarcity may affect crops. Over the past decade (2010–2019), weather-related events displaced an estimated 23.1 million people on average each year, leaving many more vulnerable to poverty. Most refugees come from countries that are most vulnerable and least ready to adapt to the impacts of climate change.

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Water Shortage: Causes and Effects

Climate change, coupled with water mismanagement and overconsumption, is causing droughts and water shortages across many parts of the globe. Aside from the obvious threat to public health, the subsequent effects of water shortage can vary from food insecurity to increased human conflicts, highlighting the importance of protecting global water resources and using them sustainably. Here are the main causes and effects of water shortage and what we can do about it.

It is increasingly evident that droughts around the world are becoming more frequent and intense, as well as are occurring at progressively prolonged periods of time. This is most demonstrable by the ongoing megadrought in the western regions of the US, where it is in the midst of its driest conditions in history . 

No continent on Earth has been untouched by water scarcity, and an increasing number of regions are reaching the limit at which they can provide water services sustainably, especially in arid regions. Nearly two-thirds of the world’s population is predicted to face water shortages by 2025. This worrying trend is causing many to pose the question: “ are we running out of water ”? 

The short answer is yes, primarily driven by climate change and global population growth. We explore what other causes are there and the major effects of it around the world. 

Causes of Water Shortage

Droughts and Climate Change

Water shortages occur due to a number of factors; one of the biggest drivers of water scarcity is drought. Drought is a natural phenomenon in which dry conditions and lack of precipitation – whether it is rain, snow or sleet –  occur over certain areas for a period of time. 

While the amount of rainfall can naturally vary between different regions and times of year, climate change and rising global temperatures are altering rainfall patterns, which in turn, impact the quality and spatial distribution of global water resources. Warmer temperatures mean that moisture in soil evaporates at faster rates, and more frequent and severe heat waves exacerbate drought conditions and contribute towards water shortages. 

These conditions also create the perfect breeding ground for wildfires, further fuelling drought season and water stress. In the 2018 Intergovernmental Panel on Climate Change (IPCC) report , climate scientists say that groundwater stored in aquifers, which provides 36% of the world’s domestic water supply for over 2 billion people, is highly sensitive to future climate change. They also concluded that wet regions are expected to get wetter while dry regions will get drier. 

In China for example, the Yangtze and Yellow Rivers are two major water resources that support the country. They rely on the glacial meltwater from the Qinghai-Tibetan Plateau. Global warming, where temperatures in the glacial region rose by 3- 3.5C over the past half-century, has produced less snow and ice mass , causing glacial run-off into the Yangtze to be reduced by 13.9% since the 1990s. 

Poor Water Management and Growing Demand

Today, the world’s population is just short of eight billion people, which translates to a growing demand for water amid water stress from climate change. Urbanisation and an exponential increase in freshwater demand for households are both driving factors behind water shortages, especially in regions with a precarious water supply. 

For example in 2018, Cape Town, South Africa experienced a water crisis and became the first modern city to effectively run out of drinking water as a result of extreme drought, poor water resource management and overconsumption. 

Likewise, China is also at risk of running out of water due to poor water management. Each year, total renewable water resources per inhabitant is estimated at about 2,018 cubic metres , which is 75% less than the global average, according to the World Bank.

Water Pollution

Contaminated and unsafe water is another contributing factor of water shortages. Water pollution already kills more people each year than war and all other forms of violence combined. As we only have less than 1% of the Earth’s freshwater accessible to us, human activity is actively threatening our own water resources. Water pollution can come from a number of sources, including sewage and wastewater – more than 80% of the world’s wastewater flows back into the environment without being treated, and agricultural and industrial runoff, where pesticides and toxic chemicals leach into the groundwater and nearby freshwater systems. Consequently, precious water resources get contaminated, resulting in less freshwater and drinking water available. 

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Effects of Water Shortage

The United Nations states that having free access to freshwater is a basic human right. And losing that access to drinking water can be detrimental to human health and lives, as we all need water to survive. However, water scarcity and shortage can lead to other serious impacts on the environment and threaten global peace and security as well. 

Food Insecurity 

We need water to produce food that we eat. Today, around 70% of freshwater withdrawals go into agriculture, from irrigation and pesticide to fertiliser application and sustaining livestock. As the global population continues to grow, agricultural production is required to expand by another 70% by 2050 to keep up with demand, thereby redirecting even more freshwater resources. 

In February 2021, the UN World Food Program reported that severe drought caused by record dry conditions has left an estimated 13 million people facing hunger in the Horn of Africa. Intense and prolonged droughts have decimated food crops and caused high rates of livestock deaths, causing food prices to soar. Families are struggling to buy and secure food as a result, while high malnutrition rates are occurring across the region. The UN warns should the situation worsens, it will spark a humanitarian crisis. 

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Increased Human Conflicts

One of the biggest effects of water shortage is that it prompts increased competition between water users, thus potentially sparking conflicts, which could potentially put millions of lives at risk. 

In India, drought has triggered serious conflict between water users at the local level, many of whom depend on water for their livelihoods. At a broader level, India has been in conflict with its neighbouring country of Pakistan over water disputes, among other political issues. The two nations have clashed over the control of upstream water barrages and infrastructure projects for decades, which regulated water flow into Pakistan. Water mismanagement and climate change are exacerbating these diplomatic tensions; The Himalayan Glaciers, which feed the Indus Basin, are predicted to diminish further in the coming year and deplete groundwater recharge in the long run.

Similarly, in Egypt, its water supply is being threatened by the development of the Grand Ethiopian Renaissance Dam on the upstream stretch of the Nile River. Though the dam brings huge economic and social benefits for Ethiopia and generate energy to two-thirds of the population, Egypt could potentially lose as much as 36% of the total water supply as the dam reduces water flowing downstream. Egypt could resort to military action to protect its water resources. 

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Water Is Now Traded as a Commodity 

Water has recently joined gold, oil and other commodities that can be traded on Wall Street , prompting fears that the market could dramatically further exacerbate the effects of water shortage and increase competition. 

The US’s water trade market, the first of its kind, was launched in 2020 with USD$1.1 billion in contracts tied to California water prices. It allows farmers, hedge funds, and municipalities to hedge against future water availability in California. While this could clear up uncertainty around water prices, treating water as a tradable commodity puts basic human rights in the hands of financial institutions and investors.

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137 Intriguing Cause & Effect Essay Topics for Students

Teach critical thinking, logic, and the art of persuasion.

Cause-and-effect essays aren’t just a way to help students strengthen their writing skills. They’ll also learn critical thinking, logic, and the art of persuasion. In addition, they teach students to demonstrate how one thing directly influences another. Coming up with engaging cause-and-effect essay topics can be challenging, but we have you covered. This list of ideas includes a variety of topics that range from social and cultural movements to mental health and the environment.

Science and Environment Cause & Effect Essay Topics

• Describe the effect of urbanization on the environment.
• What is the impact of air pollution on health?
• What are the causes and consequences of plastics on marine life?
• What is the impact of rising sea temperatures on fish and marine life?
• Describe the impact of human behavior on global warming.

• What is the effect of social media on environmentalism?
• What causes volcanic eruptions?
• What causes trees to die?
• What are the effects of gravity?
• Why are plants green?
• Why do trees shed their leaves?
• What causes a species to become endangered?
• What are some of the causes of animals losing their habitats?
• Describe the effect of overpopulation on the environment.
• What are the effects of famine on human population?
• What are the causes and effects of Antarctica floods?
• What are the effects of pollution on the ocean?
• What effect do cars have on the environment?
• Why is it important to manage wildfires?
• What has been the impact of DNA on crime scene processing?

• What are the impacts of deforestation in Brazil?
• What are the effects of GMO foods on human health?
• What are the impacts of immunizations on human health?

Technology and Social Media Cause & Effect Essay Topics

• What are the effects of social media on adolescent development?
• How does technology affect productivity?
• What are the effects of video games on childhood development?
• How do cell phones affect human relationships?
• What are some reasons a teacher might ban cell phones from class?

• What effects do cell phones have on sleep?
• What effects did the invention of the Internet have on technology?
• What were the origins of cyberbullying?
• What are the effects of tablet use on small children?
• How has online dating changed relationships?
• What makes some people less likely to use social media?
• What are the effects of social media on privacy?
• How does the rise of TikTok affect Facebook and Instagram?
• In what ways could social media lead to extremism?
• What is the impact of social media on the increasing popularity of plastic surgery and other enhancements?

• What are some of the benefits of owning a smartphone and what are some of the drawbacks?
• What has been the impact of online shopping on brick-and-mortar stores?
• What has been the impact of smartphones on marriages and relationships?
• What are the causes and effects of texting while driving?
• What has the rise of “influencers” meant for Hollywood?
• In what ways have photo filters influenced young people’s self-esteem?

Culture and Social Issues Cause & Effect Essay Topics

• What are some of the reasons for substance abuse in young people?
• What are some of the effects of bullying?
• How does economic status affect the quality of health care?
• What are some of the causes of homelessness?
• Explain the effects of ignorance on discrimination.
• What are the impacts of death sentences on social justice?

• How does financial success affect societal privilege?
• What effects does growing up poor have on children?
• In what ways does religion influence society?
• What are the effects of immigration on a host country?
• What are the effects of ageism on job opportunities?
• What is the impact of LGBTQ+ representation in TV and movies?
• What are the effects of school shootings on politics?
• How do school uniforms affect students?
• What are the impacts of high student debt?
• What are the impacts of body shaming on people?
• What were the lasting impacts of the AIDS epidemic on society?

• What impact does banning abortion have in the United States?
• What has been the impact of marriage equality in the United States?
• What are the causes and effects of noise pollution?
• What are the causes and effects of inflation on the economy?
• What are the effects of TV shows on our behavior?

Sports Cause & Effect Essay Topics

• Examine the effects of exercise on mental health.
• What led to baseball being an iconic American sport?
• What drives people to participate in extreme sports?
• In what ways did globalization affect modern sports?
• What were the effects of doping on amateur and professional sports?
• Select a sport and write about the historical factors that led to the popularization of that sport.

• Describe the ways in which youth sports influence a child’s development.
• What were the driving forces behind the first Olympics?
• How can team sports help develop social skills?
• How have e-sports changed the sporting landscape?
• In what ways do race biases influence sports?

• What are the effects of regular workouts on immunity?
• How does participating in sports affect leadership skills?
• In what ways can sports lead to character development?
• What effect does famous athletes’ social commentary have on their fans?

History Cause & Effect Essay Topics

• What are the effects of the war in Syria on the United States?
• What have been the lasting effects of the Civil Rights Movement?
• What were the causes and effects of the attack on Pearl Harbor?
• What led up to the Berlin Wall being torn down and what effects did that have?

• What lasting impact did 9/11 have on modern American society?
• What were the causes of the Salem Witch Trials?
• What was the cultural impact of the Spanish-American War?
• How has globalization led to modern-day slavery?
• What events led to the fall of the Roman Empire?
• What were the impacts of the Great Depression on women’s employment?
• How did cartels come into existence? What effect have they had on the United States and Mexico?
• What were the causes and effects of the Women’s Liberation Movement?
• Give an example of colonialism in history and name the resulting impact to the affected society.

• What led to the rise of ISIS and what has the impact been on international security?
• What factors led to the Titanic’s sinking?
• What were the causes and effects of the Vietnam War?
• Choose an American president. What led him to become president and what were the effects of his presidency?

Mental Health Cause & Effect Essay Topics

• How can stress affect the immune system?
• How does social anxiety affect young people?
• How can high academic expectations lead to depression?
• What are the effects of divorce on young people?
• How does service in the armed forces lead to post-traumatic stress disorder?

• What are the effects of mindfulness on mental health?
• Describe the ways in which the COVID-19 pandemic has impacted mental health.
• How does childhood trauma impact childhood development?
• What impact does witnessing violence have on mental health?
• What is behind increasingly high levels of anxiety in modern American society?

• What are the causes and effects of panic attacks?
• What are the causes and consequences of high stress in the workplace?
• What are some of the causes of insomnia and in what ways does it affect mental health?
• What is the impact of staying home for an extended period of time?

Current Events Cause & Effect Essay Topics

• Choose a local public education campaign. What are the effects of that campaign?
• What are the causes and effects of migration?
• What are the causes and effects of terrorist attacks?

• What are the effects of legalizing genetic engineering research?
• How do low voting rates impact elections and government?
• What is the effect of raising the minimum wage?
• What are the effects of globalization on society?
• How does gerrymandering affect election outcomes?
• What are the causes and effects of police brutality?
• What are the causes and effects of political polarization?

• What are the causes and effects of fake news?
• What are the effects of global war on citizens?
• What is the effect of international aid on poverty or health?
• Why do some countries have nuclear weapons, and what does this mean for other countries?

Education Cause & Effect Essay Topics

• What are the effects of teacher quality on student success?
• What are the causes and effects of student loan debt?
• What are the causes and effects of low graduation rates?

• What are the effects of assigning homework?
• What are the causes and effects of school funding disparities?
• What are the causes and effects of the digital divide in education?
• What is the effect of AI on education?
• What are the causes and effects of student burnout?
• Should students be required to study a foreign language in school, and what are the effects of learning a foreign language?

• What effect has the COVID pandemic had on education?
• What are the effects of same-sex classrooms or schools?

What are your best cause-and-effect essay topics for students? Come exchange ideas in the We Are Teachers HELPLINE group on Facebook.

Plus, check out our list of interesting persuasive essay topics for kids and teens..

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The Big List of Essay Topics for High School (120+ Ideas!)

Ideas to inspire every young writer! Continue Reading

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• ENVIRONMENT

How global warming is disrupting life on Earth

The signs of global warming are everywhere, and are more complex than just climbing temperatures.

Our planet is getting hotter. Since the Industrial Revolution—an event that spurred the use of fossil fuels in everything from power plants to transportation—Earth has warmed by 1 degree Celsius, about 2 degrees Fahrenheit.  

That may sound insignificant, but 2023 was the hottest year on record , and all 10 of the hottest years on record have occurred in the past decade.  

Global warming and climate change are often used interchangeably as synonyms, but scientists prefer to use “climate change” when describing the complex shifts now affecting our planet’s weather and climate systems.  

Climate change encompasses not only rising average temperatures but also natural disasters, shifting wildlife habitats, rising seas , and a range of other impacts. All of these changes are emerging as humans continue to add heat-trapping greenhouse gases , like carbon dioxide and methane, to the atmosphere.

What causes global warming?

When fossil fuel emissions are pumped into the atmosphere, they change the chemistry of our atmosphere, allowing sunlight to reach the Earth but preventing heat from being released into space. This keeps Earth warm, like a greenhouse, and this warming is known as the greenhouse effect .  

Carbon dioxide is the most commonly found greenhouse gas and about 75 percent of all the climate warming pollution in the atmosphere. This gas is a product of producing and burning oil, gas, and coal. About a quarter of Carbon dioxide also results from land cleared for timber or agriculture.  

Methane is another common greenhouse gas. Although it makes up only about 16 percent of emissions, it's roughly 25 times more potent than carbon dioxide and dissipates more quickly. That means methane can cause a large spark in warming, but ending methane pollution can also quickly limit the amount of atmospheric warming. Sources of this gas include agriculture (mostly livestock), leaks from oil and gas production, and waste from landfills.  

What are the effects of global warming?  

One of the most concerning impacts of global warming is the effect warmer temperatures will have on Earth's polar regions and mountain glaciers. The Arctic is warming four times faster than the rest of the planet. This warming reduces critical ice habitat and it disrupts the flow of the jet stream, creating more unpredictable weather patterns around the globe.  

( Learn more about the jet stream. )

A warmer planet doesn't just raise temperatures. Precipitation is becoming more extreme as the planet heats. For every degree your thermometer rises, the air holds about seven percent more moisture. This increase in moisture in the atmosphere can produce flash floods, more destructive hurricanes, and even paradoxically, stronger snow storms.  

The world's leading scientists regularly gather to review the latest research on how the planet is changing. The results of this review is synthesized in regularly published reports known as the Intergovernmental Panel on Climate Change (IPCC) reports.  

A recent report outlines how disruptive a global rise in temperature can be:

• Coral reefs are now a highly endangered ecosystem. When corals face environmental stress, such as high heat, they expel their colorful algae and turn a ghostly white, an effect known as coral bleaching . In this weakened state, they more easily die.  
• Trees are increasingly dying from drought , and this mass mortality is reshaping forest ecosystems.
• Rising temperatures and changing precipitation patterns are making wildfires more common and more widespread. Research shows they're even moving into the eastern U.S. where fires have historically been less common.
• Hurricanes are growing more destructive and dumping more rain, an effect that will result in more damage. Some scientists say we even need to be preparing for Cat 6 storms . (The current ranking system ends at Cat 5.)

How can we limit global warming?  

Limiting the rising in global warming is theoretically achievable, but politically, socially, and economically difficult.  

Those same sources of greenhouse gas emissions must be limited to reduce warming. For example, oil and gas used to generate electricity or power industrial manufacturing will need to be replaced by net zero emission technology like wind and solar power. Transportation, another major source of emissions, will need to integrate more electric vehicles, public transportation, and innovative urban design, such as safe bike lanes and walkable cities.  

( Learn more about solutions to limit global warming. )

One global warming solution that was once considered far fetched is now being taken more seriously: geoengineering. This type of technology relies on manipulating the Earth's atmosphere to physically block the warming rays of the sun or by sucking carbon dioxide straight out of the sky.

Restoring nature may also help limit warming. Trees, oceans, wetlands, and other ecosystems help absorb excess carbon—but when they're lost, so too is their potential to fight climate change.  

Ultimately, we'll need to adapt to warming temperatures, building homes to withstand sea level rise for example, or more efficiently cooling homes during heat waves.  

Related Topics

• CLIMATE CHANGE
• ENVIRONMENT AND CONSERVATION
• POLAR REGIONS

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