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All You Need to Know About Air Pollution

Air pollution is one of the most dire environmental problems in the world right now. Constant exposure to air pollutants poses incredibly high risks of health issues and premature deaths to the world’s population. We believe the first step in tackling a problem is to have knowledge of the issue at hand, so here are 10 breathtaking facts about air pollution. 

10 Facts About Air Pollution

1. less than 1% of global land area has safe air pollution levels.

According to a 2023 study , just about 30% of days in 2019 had daily concentrations of PM2.5 lower than 15 μg/m3. Moreover, researchers found that about 0.18% of the global land area and only 0.001% of the world’s population had an annual exposure to PM2.5 below the safe threshold of 5 μg/m3 .

Eastern and Southern Asia were the regions with the highest air pollution levels, followed by Northern Africa. At the other side of the spectrum are Australia and New Zealand, followed by other regions in Oceania and South America. Here, PM2.5 concentrations are the lowest, though they experienced an increase in air pollution levels over the past two decades, driven partly by  intensified and prolonged wildfire seasons . Stricter regulations led instead to a decrease in pollutants in Europe and North America over the same period.

2. At least 1 in 10 people die from air pollution-related diseases

One of the most stunning facts about air pollution is that it is a leading risk factor for chronic health diseases and premature death in the world. In 2017, air pollution was responsible for an estimated 5 million deaths globally, amounting to nearly 9% of the world’s population. Constant exposure to polluted air increases the risk of coronary and respiratory disease, stroke, diabetes and lung cancer. South East Asian countries tend to suffer the brunt of the impacts from outdoor air pollution. Air pollution-related deaths in the region accounted for 15% of deaths globally while rich nations contributed only to 2%, according to data in 2017, demonstrating a glaring disparity between developed and developing countries. 

You might also like: Half of 500,000 Air Pollution-Related Deaths in EU in 2021 Could Have Been Avoided, Study Shows

3. Air pollution is a greater threat to life expectancy than smoking, HIV or war

Air pollution is literally cutting years from the lives of billions of people around the world. According to a 2021 report by the Energy Policy Institute at the University of Chicago, residents in India, which is home to the highest levels of air pollution on the planet, lose an average of 5.9 years from their lives as a result of poor air quality. Though all top five countries with the worst air pollution are located in Asia, air pollution is a rapidly rising threat in Central and West Africa, where average life expectancy has dropped by two to five years, making it a larger threat to human health than “well-known killers like HIV/AIDS and malaria.”

4. Air pollution has a nearly US$3 trillion economic cost, or 3.3% of the world’s GDP

A report released in 2020 by Greenpeace Southeast Asia and the Centre for Research on Energy and Clean Air revealed the human and economic costs of air pollution from fossil fuels. Air pollution-related deaths are estimated to have a $2.9 trillion economic cost, and was responsible for 1.8 billion days of work absence – lowering participation rates in labour forces – 4 million new cases of child asthma, which causes children to miss more school, increasing healthcare needs and impacting guardians time away from their work, as well as 2 million preterm births in 2018. The report also points out disability from chronic diseases caused by poor air quality cost the world’s economy $200 billion , with sick leave and preterm births costing $100 billion and $90 billion respectively.

5. Death rates from air pollution are highest in low-to-middle income countries

One of the most distressing facts about air pollution is that people living in Sub-Saharan Africa and South Asia regions are significantly more likely to die from outdoor air pollution than those residing in Europe and North America, where death rates are 100 times greater. Indoor air pollution rates, which refers to the air quality within and around buildings and structure, are similarly higher in lower-income nations due to a reliance on solid fuels such as wood, crop wastes, charcoal and coal, as well as kerosene in open fires, for cooking. About 2.6 billion people in the world continue to rely on this cooking method and are vulnerable to illnesses caused by indoor air pollution. 

You might also like: Air Pollution in South Asia Cuts Life Expectancy By 5 Years on Average: Report

6. Climate change increases risks of wildfires and air pollution from it

Extreme weather events and wildfires have become more frequent and intense as a result of climate change. As drought seasons become more prolonged, as well as growing deforestation rates to make way for agriculture development, so do the risks of wildfires. Large-scale wildfires release carbon emissions, smog and pollutants into the air, which can spread across countries and regions. In July 2021, unprecedented heatwave and wildfires in the western regions of the US and Canada caused cities on the East Coast including New York to be shrouded in smoke and polluted air. Similarly, Siberia experienced one of the worst wildfires during the same period where smog reached to dangerously high levels, forcing more than 280,000 residents to remain at home. 

7. Only 7 countries in the world met WHO air quality standards in 2023

Exceptions made for Australia, Estonia, Finland, Grenada, Iceland, Mauritius, and New Zealand, all countries exceeded the annual level last year , Swiss air quality organization IQAir said in its  annual report , with several regions recording highly dangerous pollution levels. These include Bangladesh, historically among the most polluted countries in the world and the worst in 2023, with PM2.5 levels more than 15 times higher than WHO standards, Pakistan (more than 14 times higher), and India (more than 10 times higher). Tajikistan and Burkina Faso followed closely.

More on the topic: Mapping the Most Polluted Cities in the World in 2023

8. Particulate pollution in China dropped by 29% within 6 years

Despite China being the world’s largest carbon emitter and the country with the worst air pollution on the planet (with 2013 reaching its highest pollution level) where 1.25 million Chinese residents die early each year from air pollution, studies have shown the nation to have made major progress in reducing air pollution thanks to strict policy action. Within six years, particulate pollution has declined by 29% and dropped below 1990 levels. 

China has also invested more in solar energy than any other nation, representing 45% of all global investment in solar and is expected to generate twice as much power from solar as the US by 2024.  However, currently,  98% of the nation’s urban areas still exceed WHO guidelines and 53% exceed China’s own less stringent national standards. 

9. None of the world’s 100 biggest cities are able to meet WHO’s updated guidelines

One of more recent facts about air pollution: the WHO issued new stringent guidelines on air pollution in September 2021, following new research showing fine particulate matter to be more harmful than previously thought where an estimated 8.7 million people a year die early due to breathing air from coal, oil and gas burning. This accounts for 20% of global deaths.

To push countries to ramp up efforts to improve air quality, WHO’s new acceptable limit for PM2.5 has been slashed by half while nitrogen dioxide (NO2), produced mainly from diesel engines, is lowered by 75%. Based on these new guidelines, no major city is able to meet it according to an analysis by Greenpeace. The WHO says that if the world collectively reduced its air pollution levels to within the new limits, nearly 80% of air pollution-related deaths could be prevented. 

You might also like: What Are the Biggest Causes and Effects of Air Pollution?

10. Air pollution contributed to the spread of Covid-19

A recent preliminary study from Harvard University found a positive correlation between Covid-19-related mortalities and air pollution , adding that there is a plausible association of airborne particles assisting the viral spread. Based on studies observing Covid-19 related deaths and air pollution – noting that Northern Italy is one of the most polluted areas in Europe – the investigation discovered even a small increase of 1 μg/m3 in PM2.5 levels was associated with an 8% increase in Covid-19-related fatality.

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Air pollution, explained

Pollutants in the air aren't always visible and come from many different sources.

Despite decades of progress, the air quality in the United States has started to decline over the past few years, according to data in the Environmental Protection Agency's 2024 " Our Nation’s Air " report. The agency reported a nearly 38 percent increase in unhealthy air days nationwide, rising from 596 days in 2022 to 822 days in 2023 .

The American Lung Association's 2024   "State of the Air" report   shows people in the U.S. experienced the most days with "very unhealthy" and "hazardous" air quality due to particle pollution in 25 years. The report also found that 131 million people are living in areas with unhealthy levels of air pollution.

The reasons for the recent decline in air quality remain unclear, says the agency, but may be related to high numbers of wildfires , a warming climate, and increasing human consumption patterns driven by population growth and a strong economy. The long-term outlook also remains unclear, even as politicians debate air pollution standards.

What is air pollution?

Air pollution is a mix of particles and gases that can reach harmful concentrations both outside and indoors. Its effects can range from higher disease risks to rising temperatures. Soot, smoke, mold, pollen, methane, and carbon dioxide are a just few examples of common pollutants.

In the U.S., one measure of outdoor air pollution is the Air Quality Index, or AQI which rates air conditions across the country based on concentrations of five major pollutants: ground-level ozone, particle pollution (or particulate matter), carbon monoxide, sulfur dioxide, and nitrogen dioxide. Some of those also contribute to indoor air pollution , along with radon, cigarette smoke, volatile organic compounds (VOCs), formaldehyde, asbestos, and other substances.

A global health hazard

Poor air quality kills people. Worldwide, bad outdoor air caused an estimated 4.2 million premature deaths in 2016 , about 90 percent of them in low- and middle-income countries, according to the World Health Organization. Indoor smoke is an ongoing health threat to the 3 billion people who cook and heat their homes by burning biomass, kerosene, and coal. Air pollution has been linked to higher rates of cancer, heart disease, stroke, and respiratory diseases such as asthma. In   the U.S. nearly 134 million people—over 40 percent of the population—are at risk of disease and premature death because of air pollution, according to American Lung Association estimates .

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While those effects emerge from long-term exposure, air pollution can also cause short-term problems such as sneezing and coughing, eye irritation, headaches, and dizziness. Particulate matter smaller than 10 micrometers (classified as PM 10 and the even smaller PM 2.5 ) pose higher health risks because they can be breathed deeply into the lungs and may cross into the bloodstream.

Air pollutants cause less-direct health effects when they contribute to climate change . Heat waves, extreme weather, food supply disruptions, and other effects related to increased greenhouse gases can have negative impacts on human health. The U.S. Fourth National Climate Assessment released in 2018 noted, for example, that a changing climate "could expose more people in North America to ticks that carry Lyme disease and mosquitoes that transmit viruses such as West Nile, chikungunya, dengue, and Zika."

Environmental impacts

Though many living things emit carbon dioxide when they breathe, the gas is widely considered to be a pollutant when associated with cars, planes, power plants, and other human activities that involve the burning of fossil fuels such as gasoline and natural gas. That's because carbon dioxide is the most common of the greenhouse gases, which trap heat in the atmosphere and contribute to climate change. Humans have pumped enough carbon dioxide into the atmosphere over the past 150 years to raise its levels higher than they have been for hundreds of thousands of years .

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Other greenhouse gases include methane —which comes from such sources as landfills, the natural gas industry, and gas emitted by livestock—and chlorofluorocarbons (CFCs), which were used in refrigerants and aerosol propellants until they were banned in the late 1980s because of their deteriorating effect on Earth's ozone layer.

Another pollutant associated with climate change is sulfur dioxide, a component of smog. Sulfur dioxide and closely related chemicals are known primarily as a cause of acid rain . But they also reflect light when released in the atmosphere, which keeps sunlight out and creates a cooling effect. Volcanic eruptions can spew massive amounts of sulfur dioxide into the atmosphere, sometimes causing cooling that lasts for years. In fact, volcanoes used to be the main source of atmospheric sulfur dioxide; today, people are.

Airborne particles, depending on their chemical makeup, can also have direct effects separate from climate change. They can change or deplete nutrients in soil and waterways, harm forests and crops, and damage cultural icons such as monuments and statues.

What can be done?

Countries around the world are tackling various forms of air pollution. China, for example, is making strides in cleaning up smog-choked skies from years of rapid industrial expansion, partly by closing or canceling coal-fired power plants. In the U.S., California has been a leader in setting emissions standards aimed at improving air quality, especially in places like famously hazy Los Angeles. And a variety of efforts aim to bring cleaner cooking options to places where hazardous cookstoves are prevalent.

In any home, people can safeguard against indoor air pollution by increasing ventilation, testing for radon gas, using air purifiers, running kitchen and bathroom exhaust fans, and avoiding smoking. When working on home projects, look for paint and other products low in volatile organic compounds: organizations such as Green Seal , UL (GREENGUARD) , and the U.S. Green Building Council can help.

To curb global warming, a variety of measures need to be taken , such as adding more renewable energy and replacing gasoline-fueled cars with zero-emissions vehicles such as electric ones. On a larger scale, governments at all levels are making commitments to limit emissions of carbon dioxide and other greenhouse gases. The Paris Agreement , ratified on November 4, 2016, is one effort to combat climate change on a global scale. And the Kigali Amendment seeks to further the progress made by the Montreal Protocol , banning heat-trapping hydrofluorocarbons (HFCs) in addition to CFCs.

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Air Pollution Sources, Effects and Ways of Minimizing Definition Essay

Introduction, air pollution, sources of air pollution, classification of air pollutants, works cited.

Generally, pollution is the process of introducing new materials, contaminants, into the natural environment leading to adverse effects. There are different types of pollution. These include air pollution, sound pollution, light pollution, littering, and soil contamination.

From the above definition of pollution, it is clear that pollutants are foreign substances and particles that contaminate the environment. This paper discusses the various sources of air pollution, the effects of air pollution, and ways of minimizing air pollution. The paper also discusses two classes of pollutants: indoor pollutants and outdoor pollutants.

Air pollution is the process of introducing pollutants into the atmosphere willingly or unwillingly. Human beings perform certain activities that lead to air pollution. For instance, the burning of bushes leads to air pollution. When pollutants enter the atmosphere, they pollute it. Examples of these pollutants include commercial chemicals, foreign particles, and biological substances. After entering the atmosphere, they become part of the atmosphere and they mix with air components.

These pollutants are dangerous especially if living organisms inhale them. They can cause diseases, death of living organisms such as plants and animals, deterioration of the natural environment, and uneasiness. In other words, the introduction of unwanted materials into the atmosphere is a dangerous phenomenon. Air pollutants can also cause other problems. For example, they can damage the built environment and ecosystems of living organisms (Gay 3-14).

According to scientists, the atmosphere is an intricate innate gaseous system that is so much beneficial to all living organisms—plants and animals. In fact, a clean atmosphere supports life on earth. This is the reason why all human beings should stop activities that lead to the contamination of the atmosphere.

Most importantly, scientists across the globe continue to warn people that the stratospheric ozone depletion is dangerous, and can cause health hazards. Undoubtedly, when air pollutants enter the atmosphere, they destroy the ozone layer. The depletion of the ozone layer means that earth’s ecosystems will suffer.

According to research, air pollution is common in urban areas due to many vehicles that emit fumes to the atmosphere. Moreover, in urban areas, many factories release dangerous gases to the atmosphere leading to air pollution.

In rural areas, the burning bushes and lighting of unnecessary fire also causes air pollution. In rural areas where farming is a common activity, farmers pollute the atmosphere by spraying chemicals to food crops. Notably, since the earth is the only planet that supports life, it is necessary to avoid activities that cause air pollution.

Therefore, all human beings should take into consideration the effects of their activities, especially those that cause air pollution. Moreover, people should understand that although economic activities are good for their welfare, they can survive for few days without food, but they cannot survive even a second minus oxygen. This is the main reason why people should avoid all activities that contaminate the atmosphere.

Many people do not understand the importance of keeping the environment clean and free from any contamination. Perhaps this is the main reason why many of them engage in activities that contaminate the environment. For instance, the exploitation of natural resources and industrialization can emit dangerous gases into the atmosphere.

Additionally, green house gases also emit dangerous gases to the atmosphere. For example, green house gases such as sulfur trioxide and carbon dioxide are some of the dangerous gases that enter the atmosphere. Definitely, the destruction of the atmosphere is a serious issue of concern to many people, as the contamination of the atmosphere causes serious health hazards. Undeniably, air pollution is one of the problems facing the world today.

The challenge of air pollution started during the industrial revolution age. During those times, many people did not understand the effects of contaminating the atmosphere. There is no doubt that industrial revolution brought significant developments such as improved means of transport, cheaper merchandise, and the improvement of life.

However, the development of technology came at a price. For example, the construction of many factories has increased the percentage of dangerous gases in the atmosphere. However, due to increase of knowledge, many people are now aware of the causes and dangers of air pollution.

For example, automobiles burn gasoline thus emitting dangerous gasses to the atmosphere. In addition, the incineration of products also emits dangerous gases to the atmosphere. Furthermore, smoke from factories also emits dangerous particles and gases into the atmosphere that is dangerous to the life of living organisms.

In fact, the main reason why air pollution is more dangerous than other forms of pollution is that it involves the depletion of the ozone layer, which supports life on earth. For instance, gaseous by-products from industries can cause death of organisms once they inhale contaminated air. Therefore, as the world becomes more industrialized, there will be continued air pollution and increased health hazards.

In some instances, air pollution can occur from natural sources, which are beyond the control of human beings. For example, the destruction of forest by fire causes leads to air pollution. The eruption of volcanoes and dust storms are also other examples of natural air pollutants. In some cases, the polluted air combines with raindrops to form acid rain, which is another form of air pollution.

The effects of acid rain are catastrophic and they include the annihilation of crops, erosion of buildings, and destruction of other assets. Moreover, acid rain can also cause global warming, which is one of the very many issues affecting the world today. According to scientists, air pollution leads to climate change, and that people will soon start noticing climate change patterns and alterations. If there is continued air pollution, the average global temperature will rise and this will increase health hazards and respiratory deaths.

Of course, the two major classes of causes of air pollutants are indoor and outdoor. In the former, we have a number of pollutants that emit dangerous gases to the atmosphere.

For example, furnishings and cleaners are examples of indoor pollutants. Mold is also another indoor air pollutant that is very dangerous. To start with, mold is a microscopic organism common on surfaces with high humidity percentages. For instance, on the body of human beings, mold can grow into the skin and cause health implications, asthma and allergic reactions.

Recently, scientists have also associated mold with chronic sinus infections that is not only dangerous, but can also cause death of organisms. Additionally, mold can cause breathing difficulties, breeding from the lungs. It can also cause memory loss and hearing impairments. Clearly, indoor pollutants are dangerous. However, as compared to outdoor pollutants, they are minimal (Farrah and Brook 1240-1241).

Ordinarily, outdoor pollutants are common in the atmosphere, which contains the air that living organisms inhale. Pollutants from industries, automobiles, airplanes, and other machines emit fissile fuels into the air. These are some of the examples of outdoor air pollutants. Different factories, depending on what they manufacture, emit different gases to the atmosphere. Moreover, some factories release sulfuric acid fumes to the atmosphere, which can cause respiratory difficulties.

When it is raining, the raindrops combine with these fumes to form acid rain that is dangerous to the life of living organisms, and destruction of property especially in the northern hemisphere region. In northern lakes, organisms living in water such as fish die due to acid rain. Ironically, the solution to this predicament is quite involving and expensive, as it is not easy to clear sulfur from coal due to burning. However, it is easier to clear carbon dioxide from the air as compared to other gases.

Statistics indicate that carbon dioxide is the most abundant air pollutant in the atmosphere compared to chlorofluorocarbons such as nitrogen oxide and sulfur oxide from green houses. This is due to rampant deforestation and release of fossil fuels into the atmosphere. Nevertheless, green plants help in clearing carbon dioxide from the atmosphere (Tyson 57-77).

Many countries have come together to enact laws that will protect the environment for future generations. From the Kyoto Protocol to the Clean Air Act, countries across the globe continue to adopt laws that will govern the protection of the environment.

However, adopting laws is not enough, as countries must commit themselves to protecting the environment. For example, the development of electric vehicles will reduce emission of fossil gases to the atmosphere. Factories should also use resources that emit fewer gases to the atmosphere.

For example, in the place of coal they can use natural gas, which emits les gas. Motorists should also turn-off their engines in order to reduce more gas emissions into the atmosphere. Although the world has made progressive advances towards a clean atmosphere, industrial development remains the biggest hindrance. Nevertheless, many countries have pledged to reduce gas emissions in order to protect the atmosphere from contamination for future generations.

Farrah, Mateen, and Robert Brook. “Air Pollution as an emerging global risk factor for stroke.” Journal of American Medical Association , 305.12(2011): 1240-1241. Print.

Gay, Kathlyn. Air Pollution. New York: F. Watts, 1991. Print.

Tyson, Peter. Acid Rain. New York: Chelsea House, 1992. Print.

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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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