Brian Barton
Air pollution is a serious health and environmental issue, causing a range of respiratory and other diseases. It is a problem that has existed since the earliest ancestors, but it has become increasingly concerning with growing populations and industrialization. While air quality has improved in recent decades, with death rates from air pollution nearly halving since 1990, new data shows that air pollution in the US has increased since 2016, ending years of improvement. This rise has been linked to increased driving and natural gas burning, despite the decline in coal use. In 2023, about 66 million tons of pollution were emitted into the US atmosphere, contributing to ozone formation, acid deposition, and visibility impairment. These emissions also have severe health consequences, with air pollution being a leading risk factor for death and poor health worldwide.
| Characteristics | Values |
|---|---|
| Global emissions of local air pollutants | Have probably passed their peak |
| Global air pollution | Is falling |
| Ammonia emissions | Are still rising |
| Air pollution in the US | Increased nationally since 2016, reversing a decades-long trend |
| Air pollution in the US | Increased by 5.5% on average across the country between 2016 and 2018 |
| Air pollution in the US | Is linked to 10,000 additional premature deaths |
| Air pollution | Is a health and environmental issue across all countries |
| Air pollution | Is a leading risk factor for death |
| Air pollution | Has contributed to one in ten deaths globally |
| Air pollution | Has nearly halved since 1990 |
| Air pollution | Is linked to respiratory and other diseases |
| Air pollution | Is a risk factor for heart disease, stroke, lower respiratory infections, lung cancer, diabetes, and chronic obstructive pulmonary disease |
| Air pollution | Kills 7 million people every year |
| Air pollution | Is linked to an increased risk of dementia, anxiety and depression |
| Air pollution | Is caused by combustion devices, motor vehicles, industrial facilities and forest fires |
| Air pollution | Is caused by the burning of fossil fuels |
| Air pollution | Is linked to a significant risk of miscarriage |
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What You'll Learn
Air pollution has been a problem since the earliest ancestors
Air pollution has been a problem since the earliest human ancestors. As human populations have increased, so have the presence and spread of bacteria and disease. During the Middle Ages, for instance, diseases such as cholera and typhoid fever spread across Europe, directly caused by the unsanitary conditions resulting from human and animal waste.
The Industrial Revolution, beginning in the 1820s, brought about a new kind of pollution. The transition to mechanised factory systems, chemical manufacturing, iron production, and the increased use of steam and water power resulted in the release of industrial waste. In 1897, a report to the Royal Commission on River Pollution detailed the gross industrial contamination of the Tawe River in Wales, noting that it was polluted by "alkali works, copper works, sulfuric acid liquid, sulfate of iron from tin-plate works, and by slag, cinders and small coal."
In the 19th century, episodes of "smog" (a combination of smoke and fog) in cities like New York and London resulted in many deaths. Air pollution continued to be a significant problem through the middle of the 20th century. In October 1948, 20 people were asphyxiated and over 7,000 became seriously ill due to severe air pollution in Donora, Pennsylvania. This incident led to the creation of the Air Pollution Control Act of 1955, the first federal attempt to control air pollution.
Since then, clean air legislation has been revised and strengthened, with acts such as the Clean Air Act of 1990, which sets limits on the discharge of air pollutants from industrial facilities and motor vehicles, and addresses issues like acid rain and ozone depletion. Despite these efforts, air pollution remains a pressing issue, with approximately 140 million people in the United States living in counties with pollution levels above the primary NAAQS in 2023.
To combat this, the EPA has developed national programs aimed at significantly reducing air emissions, thereby improving health, longevity, and quality of life for Americans. Similar transitions towards renewable energy sources are also being made in other countries, such as Norway, which is leading the way in the shift from petrol to electric cars. While air pollution has been a persistent issue since the earliest ancestors, these efforts to address it give hope for a healthier future.
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Pollution control policies
While it is difficult to pinpoint the exact year when pollution numbers were raised, it is evident that pollution has been a significant issue for centuries, with notable incidents occurring as early as the Middle Ages. However, the industrial revolution and the widespread use of automobiles in the 19th century exacerbated air pollution, leading to deadly episodes of "smog" in cities like New York and London.
In the 20th century, water and air pollution in urban areas continued to worsen. The Cuyahoga River in Cleveland, Ohio, became a symbol of environmental neglect as it caught fire multiple times between 1936 and 1969 due to the accumulation of debris and oil on its surface. The 1969 fire, in particular, sparked nationwide outrage and led to the creation of the Federal Water Pollution Control Act (commonly known as the Clean Water Act) in 1972. This legislation provided funding for improving sewage treatment plants and set limits on industrial discharges into water bodies.
To address air pollution, the Air Pollution Control Act was enacted in 1955, marking the first federal attempt to control air pollution. This was followed by the Clean Air Act of 1970, which effectively reduced visible smogs in cities. The 1990 Clean Air Act Amendments introduced market-based incentives, such as pollution fees and marketable permits, to further reduce pollution. The motor vehicle emissions-control program has been one of the most complex and costly federal pollution-control policies, with the EPA imposing exhaust emission controls on new cars and conducting extensive testing.
While global emissions of local air pollutants may have passed their peak, certain pollutants like ammonia continue to rise, and pollution remains a critical issue in many parts of the world. The transition from petrol to electric cars, as seen in Norway, offers a promising path toward reducing air pollution. Overall, pollution control policies have played a crucial role in improving air and water quality, and ongoing efforts are necessary to sustain and accelerate these improvements.
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Air pollution increases the risk of miscarriage
Air pollution has been a problem since the appearance of our earliest ancestors, and it has only worsened with increasing human populations. While there have been efforts to reduce pollution, such as the Clean Water Act and the Clean Air Act, it continues to be a pressing issue.
In recent years, research has emerged linking air pollution to an increased risk of miscarriage. Studies have found that exposure to fine particulate matter, specifically PM2.5 and PM10, during pregnancy may increase the risk of miscarriage. For example, a study across 33 African countries found a positive association between self-reported miscarriage and exposure to PM2.5. Another study of 509 mothers in Mexico City revealed that a 5-μg/m3 increase in average PM2.5 exposure during pregnancy was associated with a 1.59 times higher risk of postpartum depression at 6 months.
While the exact mechanism by which air pollution affects pregnancy is not yet fully understood, oxidative stress, epigenetic factors, and immune mechanisms are thought to play a role. The pollutants may cause stress and inflammation, leading to adverse health outcomes for both the mother and the fetus. It is important to note that other factors, such as genetic abnormalities, can also contribute to miscarriage, and comprehensive research should consider these variables.
To protect the health of pregnant women and their babies, researchers are advocating for reduced air pollution levels. This includes implementing policies and actions to tackle the issue and exploring ways to safeguard vulnerable populations from the harmful effects of air pollution.
As climate change intensifies and environmental conditions conducive to high air pollution become more prevalent, the impact of air pollution on pregnancy is expected to become an even more significant public health concern. Therefore, urgent global efforts are needed to address this growing challenge.
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Air pollution is a leading cause of death
Air pollution is a major threat to global health and prosperity. It is one of the leading causes of death worldwide, with more than 6.5 million deaths each year, a number that has increased over the past two decades. In 2019, this number rose to 6.7 million deaths. Air pollution is a mix of hazardous substances from both human-made and natural sources. Vehicle emissions, fuel oils, natural gas used for heating, manufacturing by-products, power generation, and chemical production fumes are the primary sources of human-made air pollution.
Air pollution has been a problem for centuries, with increasing human populations opening the door to more bacteria and disease. During the Middle Ages, diseases such as cholera and typhoid fever broke out across Europe due to unsanitary conditions caused by waste and garbage. In the 19th century, episodes of "smog" in cities led to many deaths, and air pollution continued to be a significant problem through the middle of the 20th century. In 1948, severe air pollution over Donora, Pennsylvania, resulted in 20 deaths and over 7,000 people becoming seriously ill. This incident led to the creation of the Air Pollution Control Act of 1955, the first federal attempt to control air pollution.
Since then, clean air legislation has been revised and strengthened. The Clean Air Act of 1990 set limits on the discharge of air pollutants from industrial facilities and motor vehicles and addressed acid rain and ozone depletion. As a result of this act, leaded gasoline was phased out, and airborne lead concentrations in the U.S. decreased by 98% between 1980 and 2005. Despite these efforts, air pollution continues to be a significant issue, with approximately 140 million people in the U.S. living in counties with pollution levels above the primary NAAQS in 2023.
Air pollution is a key risk factor for many leading causes of death, including heart disease, stroke, lower respiratory infections, lung cancer, diabetes, and chronic obstructive pulmonary disease (COPD). It is also linked to an increased risk of cancer, cardiovascular disease, respiratory diseases, diabetes mellitus, obesity, and reproductive, neurological, and immune system disorders. In 2023, a study found that two air pollutants, ozone and PM2.5, were linked to asthma-related changes in children's airways. Additionally, long-term exposure to PM2.5, PM10, and nitrogen dioxide was associated with chronic bronchitis in women.
While global emissions of local air pollutants may have passed their peak, with a 78% decrease in the six principal air pollutants between 1970 and 2023, air pollution remains a serious issue, especially in low- and middle-income countries, where more than 90% of pollution-related deaths occur.
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Air pollution and climate change
Climate change caused by air pollution leads to more frequent and severe extreme weather events, including longer summers, increased wildfires, and droughts. These events further contribute to increased levels of tropospheric ozone and particulate matter pollution, which have detrimental effects on the environment and human health. Additionally, global warming caused by air pollution results in more stagnant air masses that trap pollution, further degrading air quality.
To address these interconnected issues, a multifaceted approach is necessary. This includes transitioning from fossil fuels to renewable energy sources, such as solar and wind power, and promoting electric vehicles to reduce transportation-related pollution. Energy efficiency programs and renewable energy sources can significantly reduce power plant emissions. Additionally, addressing natural gas leaks and reducing methane emissions are crucial steps in mitigating global warming and air pollution.
While there has been progress in reducing air pollution, particularly in developed countries, it remains a significant challenge. In 2023, about 66 million tons of pollution were emitted into the atmosphere in the United States, contributing to the formation of ozone and particles, acid deposition, and visibility impairment. However, it is important to note that air pollution and climate change are global issues, and developing and middle-income countries are often disproportionately affected.
To summarize, air pollution and climate change are intricately linked, with burning fossil fuels as the primary driver of both issues. Addressing air pollution through a combination of technological innovations, policy changes, and public education can have immediate and far-reaching benefits for human health, the environment, and the climate. By tackling air pollution, we can also make significant progress in mitigating climate change and improving the health and well-being of people worldwide.
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Frequently asked questions
In 2020, a study by the New York Times revealed that America's air quality had worsened, ending years of improvement. Fine particulate pollution increased by 5.5% on average across the country between 2016 and 2018.
Researchers identified an increase in driving and the burning of natural gas as likely contributors to the rise in unhealthy air. A decrease in enforcement of the Clean Air Act may have also played a role.
Air pollution is a major public health concern, with particulate matter, carbon monoxide, ozone, nitrogen dioxide, and sulfur dioxide being pollutants of particular worry. It is a risk factor for respiratory diseases, heart disease, stroke, lower respiratory infections, lung cancer, diabetes, and chronic obstructive pulmonary disease (COPD).
