Helena Joyce
Air pollution in the United States has improved in recent years, with the EPA taking steps to dramatically improve air quality through the development of national programs. Despite this, air pollution continues to threaten the health and welfare of Americans. In 2023, approximately 140 million people lived in counties with pollution levels above the primary NAAQS, and the burden of living with unhealthy air is disproportionately borne by communities of color. Air pollution is caused by various factors, including increased vehicle ownership, combustion processes, and industrial activities, and it has severe health consequences, including respiratory and cardiovascular diseases, infections, and cancer. The prevalence of these health issues varies across racial and socioeconomic lines, with African Americans and lower-income populations experiencing higher risks and mortality rates. While the EPA plays a crucial role in protecting public health, its effectiveness is threatened by staffing and funding cuts, as well as questions surrounding the reliability of pollution measurement practices.
| Characteristics | Values |
|---|---|
| Air Pollution Levels in 2023 | Approximately 140 million people lived in counties with pollution levels above the primary NAAQS |
| Air Toxics Emissions in 1990 | 74% decline in emissions by 2017 |
| Air Quality Improvements | Dramatic improvements by EPA through national programs |
| Air Pollutants | Nitrogen dioxide, sulfur dioxide, ozone, particulate matter (PM10, PM2.5), lead compounds, carbon dioxide |
| Polluted Cities | Bakersfield, Los Angeles, Yosemite Lakes |
| Clean Cities | Bangor, San Juan |
| Polluted States | Western states, Texas, midwestern and eastern states impacted by Canadian wildfires |
| Affected Communities | Communities of color, people with asthma, diabetes, heart disease |
| Air Quality Improvements | Clean Air Act, EPA regulations, technological advancements |
| Air Pollution Consequences | Asthma attacks, sickness, low birth weight, chronic health conditions |
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What You'll Learn
Air pollution and health
Air pollution is a serious health concern in the United States, affecting millions of people and contributing to a range of negative health outcomes. While there has been progress in improving air quality over the years, particularly since the implementation of the Clean Air Act in the 1970s, nearly half of Americans still live in areas with unhealthy levels of air pollution. This has significant implications for public health and welfare.
One of the key health impacts of air pollution is its effect on respiratory health. Particulate matter and pollutants such as nitrogen dioxide (NO2) and sulfur dioxide (SO2), primarily from vehicle emissions, can cause and exacerbate respiratory issues such as asthma and chronic obstructive pulmonary disease (COPD). Exposure to air pollution has been linked to increased asthma attacks, hospital admissions for respiratory illnesses, and even premature deaths, particularly in vulnerable individuals such as children, older adults, and people with pre-existing lung diseases.
Air pollution has also been associated with adverse cardiovascular effects. Fine particulate matter and pollutants can enter the bloodstream and contribute to heart disease, high blood pressure, and other cardiovascular problems. Additionally, air pollution has been linked to adverse neurological impacts, particularly in children. For example, exposure to lead pollution has been associated with behavioural problems, learning deficits, and lowered IQ.
Communities of colour are disproportionately affected by air pollution and are more vulnerable to its health impacts. They are twice as likely to live in areas with high levels of soot and ozone pollution and are more likely to have underlying health conditions that increase their susceptibility to the effects of air pollution. This disparity highlights the environmental injustices faced by marginalised communities.
While the United States Environmental Protection Agency (EPA) has played a crucial role in regulating air pollution and protecting public health, recent staffing and funding cuts, as well as potential rollbacks on air quality regulations, threaten to undermine these efforts. It is essential to recognise that air pollution is a persistent health hazard that demands ongoing attention, research, and policy interventions to safeguard the well-being of all Americans.
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Climate change and pollution
In the United States, air pollution poses a significant threat to the health and welfare of its citizens. Despite improvements in air quality over the years, approximately 140 million people lived in counties with pollution levels above the primary National Ambient Air Quality Standards (NAAQS) in 2023. This is reflected in the "State of the Air" report by the American Lung Association (ALA), which found that over one-third of US residents live in areas with unhealthy levels of air pollution.
Climate change plays a crucial role in exacerbating these pollution challenges. Wildfires, extreme heat, drought, and other climate-related events contribute to increased particle pollution and ozone levels, negatively impacting air quality. For example, the 2023 "State of the Air" report noted a deadly heat wave in Texas and wildfires in Canada, which led to a significant increase in ozone and particle pollution in central and eastern states.
The sources of air pollution are diverse and range from transportation to power plants and manufacturing industries. Vehicle emissions, in particular, contribute significantly to air pollution through the release of nitrogen dioxide (NO2) and sulfur dioxide (SO2). Additionally, the combustion of fossil fuels releases carbon dioxide, the primary driver of climate change, accounting for about 79% of the country's greenhouse gas emissions in 2021.
The effects of climate change and pollution are far-reaching and extend beyond physical health. Social consequences, such as distributive justice and mental health issues, arise due to historic prejudices and limited resources for those impacted by climate change. Vulnerable communities, including people of colour, the poor, elderly, and marginalized groups, often bear the brunt of these impacts as they reside in areas lacking the infrastructure to withstand natural disasters and the health consequences that arise from them.
To address these challenges, the Environmental Protection Agency (EPA) has implemented various measures. The Clean Power Plan, announced in 2015, aims to reduce carbon pollution from power plants and address climate change. The EPA has also established emission standards for vehicles and worked with the National Highway and Traffic Safety Administration to improve fuel economy. Despite these efforts, the EPA faces threats from staffing and funding cuts, which could hinder its ability to continue its vital work in protecting public health and the environment.
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Pollution sources
Air pollution in the United States is a pressing issue, with approximately 140 million people living in counties with pollution levels above the primary NAAQS in 2023. The sources of this pollution are varied and numerous, and while progress has been made in reducing emissions, the changing climate is making it increasingly difficult to protect air quality and human health.
One significant source of pollution in America is transportation. Vehicle emissions release various chemical compounds and hazardous particulate matter into the air, with nitrogen dioxide being a chief offender. Cars and trucks contribute to the formation of ground-level ozone, which has negative health effects, and despite a reduction in car traffic due to COVID-19 restrictions, pollution levels remained similar due to the continued operation of factories, refineries, power stations, and heavy-duty trucks.
Industrial sources, such as factories, power plants, and manufacturing facilities, also contribute significantly to air pollution in the United States. These sources have been regulated over time, leading to a reduction in emissions from these sectors. However, the production and distribution of electricity continue to be major sources of pollution, particularly in terms of carbon dioxide emissions.
Another source of pollution is agriculture, including both animal agriculture and the burning of fossil fuels for heating and cooking. Dust from construction and roads, as well as mining and material extraction, releases large amounts of particulate matter into the air. Wildfires, which are becoming more frequent due to climate change, can also blanket entire regions in smoke, driving up particle pollution and ozone levels.
The U.S. Environmental Protection Agency (EPA) plays a crucial role in protecting people's health from air pollution. They track emissions data, develop statistical approaches to understand weather influences, and design national programs to reduce air emissions. However, the EPA faces challenges due to staffing and funding cuts, threatening their ability to continue their important work.
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Pollution by state
Air pollution is a serious health threat in the United States, affecting the respiratory and cardiovascular systems and causing a range of adverse health outcomes. While air quality has improved in recent years, approximately 140 million people in the US lived in counties with pollution levels above the primary NAAQS in 2023.
California
California has generally been successful in reducing pollution from automobiles, trucks, and power stations. However, the state has been plagued by wildfires, which have had a detrimental impact on air quality. In 2020, wildfires contributed to an increase in air pollution, with Yosemite Lakes, California, being the most polluted city in the US that year, according to IQAir. Bakersfield, California, has had the worst short-term particle pollution for three consecutive years and the worst level of year-round particle pollution for six years in a row, according to the "State of the Air" report. Los Angeles, meanwhile, has consistently ranked as the city with the worst ozone pollution in the nation, although residents have been exposed to fewer days of unhealthy ozone levels in recent years.
Texas
In 2023, Texas experienced a deadly heatwave that drove up levels of ozone and particle pollution.
Eastern States
In 2023, an unprecedented blanket of smoke from wildfires in Canada drove up levels of ozone and particle pollution in dozens of central and eastern states.
Hawaii
Waimea, Hawaii, was ranked as the cleanest city in the US in 2020 by IQAir, with an Air Quality Index (AQI) score of just 9.
It is worth noting that the US Environmental Protection Agency (EPA), which plays a crucial role in protecting people's health from air pollution, is facing significant staffing and funding cuts that threaten its ability to continue this work effectively.
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Air quality standards
The United States Environmental Protection Agency (EPA) is responsible for setting National Ambient Air Quality Standards (NAAQS) in America. The Clean Air Act, last amended in 1990, requires the EPA to set NAAQS for six principal pollutants ("criteria" air pollutants) that are common in outdoor air, harmful to public health, and harmful to the environment. These pollutants include particulate matter, ozone, nitrogen oxides, sulfur oxides, carbon monoxide, and lead. The Clean Air Act identifies two types of NAAQS: primary standards and secondary standards.
Primary standards aim to protect public health, including that of ''sensitive'' populations such as asthmatics, children, and the elderly. These standards are designed to provide an adequate margin of safety for individuals who are particularly vulnerable to the harmful effects of air pollution.
Secondary standards, on the other hand, focus on protecting public welfare. These standards aim to safeguard against adverse effects on soils, water, crops, vegetation, man-made materials, animals, wildlife, weather, visibility, and climate. Additionally, secondary standards aim to prevent damage to property and transport systems.
The EPA is responsible for periodically reviewing the NAAQS and the scientific basis behind them. This review process involves a comprehensive assessment of relevant scientific literature, risk assessment, and public input. The EPA has made significant progress in improving air quality, with a 74% decline in emissions of air toxics from 1990 to 2017. However, despite these efforts, approximately 140 million people in America lived in counties with pollution levels above the primary NAAQS in 2023.
Additionally, California has its own ambient air quality standards (CAAQS), which predate the EPA's formation in 1970. California's standards were adopted in 1971, and the state continues to mandate them, although attainment of NAAQS takes precedence.
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Frequently asked questions
Yes, air pollution is a major problem in the United States, with approximately 140 million people living in counties with pollution levels above the primary NAAQS in 2023. Air pollution is a significant threat to Americans' health and welfare, causing various health issues, including respiratory and cardiovascular problems, and even death.
There are several sources of air pollution in America, including vehicle emissions, industrial facilities, power plants, refineries, and construction sites. Wildfires, which are becoming more frequent due to climate change, also contribute to air pollution by releasing large amounts of particulate matter and ozone into the atmosphere.
Air pollution has been linked to a range of health issues, including respiratory problems such as asthma and chronic obstructive pulmonary disease (COPD), as well as cardiovascular issues such as heart disease and high blood pressure. It is also associated with increased hospitalization and mortality rates, particularly from cardiovascular disease and cancer. Certain groups, such as children, the elderly, and communities of color, are more vulnerable to the health effects of air pollution.
Efforts are being made to reduce air pollution in America, primarily through the implementation of regulations and standards by the Environmental Protection Agency (EPA). The Clean Air Act, for example, has helped reduce emissions from transportation, power plants, and manufacturing. The Clean Power Plan also aims to reduce carbon pollution from power plants and address climate change. Despite these efforts, air pollution remains a significant challenge, and further action is needed to protect public health and improve air quality.
