Brian Barton
Pollution is a pressing issue that has attracted increasing media coverage since 2010. While there have been improvements in air quality in some countries, pollution remains a significant threat to health and prosperity worldwide. In recent years, air pollution has worsened in the US, reversing a decade-long trend of cleaner air. This increase in pollution has been linked to rising natural gas use, increased driving, and the rollback of regulatory enforcement. Globally, deaths caused by modern forms of pollution, such as ambient air pollution and toxic chemical pollution, have risen by 66% since 2000. Addressing pollution and mitigating its health impacts require a concerted effort from countries worldwide.
| Characteristics | Values |
|---|---|
| Global death rates from air pollution | Globally, death rates from total air pollution have declined in recent decades. Since 1990, death rates have nearly halved. |
| Death rates from indoor pollution | There has been an impressive decline in death rates from indoor pollution. |
| Death rates from outdoor pollution | Improvements in death rates from outdoor pollution have been modest. |
| Air pollution death rates by country income | More than 90% of pollution-related deaths occur in low- and middle-income countries. |
| Air pollution-related deaths | Air pollution causes over 6.5 million deaths each year globally, and this number is increasing. |
| Lead poisoning-related deaths | Lead poisoning causes 1.8 million deaths each year globally, which is likely an undercount. |
| Chemical pollution-related deaths | Chemical pollution causes 1.8 million deaths each year globally, which is probably an undercounted figure. |
| Deaths from modern forms of pollution | Deaths caused by modern forms of pollution (ambient air pollution, toxic chemical pollution, and lead pollution) have increased by 7% since 2015 and by over 66% since 2000. |
| Total emissions of six principal air pollutants in the US | Between 1970 and 2023, total emissions of the six principal air pollutants dropped by 78%. |
| CO2 emissions in the US | CO2 emissions in the US have shown an overall decrease since 2007, and in 2022 were 17% higher than in 1970. |
| US air pollution trends since 2016 | Air pollution in the US has increased nationally since 2016, reversing a multi-decade trend toward cleaner air. |
| US fine particulate pollution trends since 2016 | Fine particulate pollution increased by 5.5% on average across the US between 2016 and 2018, after decreasing by nearly 25% over the previous seven years. |
| Factors contributing to the increase in US air pollution since 2016 | Rising natural gas use, increased driving, and an increase in wildfires. |
| Factors contributing to the increase in US fine particulate pollution since 2016 | Rising natural gas use and increased driving. |
| US air toxics emissions since 1990 | From 1990 to 2017, emissions of air toxics declined by 74%. |
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What You'll Learn
- Air pollution in the US has increased since 2016, reversing a long-term downward trend
- The Clean Air Act has been credited with improving air quality, but enforcement has decreased
- Air pollution is the leading environmental cause of premature death, with 9 million deaths per year
- Deaths from modern forms of pollution have risen 66% since 2000, driven by industrialisation
- Carbon dioxide emissions have increased every decade since the 1960s, driven by human activity
Air pollution in the US has increased since 2016, reversing a long-term downward trend
The EPA has been instrumental in monitoring and regulating air pollution, and their data shows that emissions of common air pollutants have been reduced substantially since 1980. The Clean Air Act has successfully driven pollution reduction for over 50 years, and the EPA has made significant progress in protecting national treasures from pollution. However, recent years have seen a reversal of this trend, with the EPA's own data showing an increase in air pollution since 2016. This is supported by the State of the Air report, which found that air pollution on the West Coast improved in 2023 but was exacerbated by a deadly heatwave in Texas and wildfires in Canada, which affected air quality in central and eastern states.
The burden of air pollution is not shared equally, and communities of color are disproportionately exposed to unhealthy air, putting them at higher risk for illnesses such as asthma, diabetes, and heart disease. This disparity is also seen on a global scale, with low and middle-income countries bearing a greater burden of air pollution due to indoor pollution from solid fuel use and outdoor pollution from industrialization.
While modern technology has played a role in reducing air pollution, certain economic sectors, such as agriculture, utilities, manufacturing, and transportation, contribute disproportionately to air pollution-related damages. Despite the overall decline in emissions, certain pollutants associated with fires, carbon monoxide, and particle pollution have increased.
To address these challenges, the EPA is working with states to improve data and implement the 2010 sulfur dioxide and nitrogen dioxide standards. They are also issuing federal emissions standards for new vehicles and industrial equipment and providing forecasts of UV radiation risk to protect the ozone layer.
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The Clean Air Act has been credited with improving air quality, but enforcement has decreased
The Clean Air Act (CAA) is a federal law that gives the Environmental Protection Agency (EPA) the authority to regulate air pollutants and polluting industries. The law has been amended several times since its inception in 1967, with major updates occurring in 1970, 1977, and 1990. These amendments have established national ambient air quality standards (NAAQS) and set goals for achieving these standards across all states. The EPA has also issued emissions standards for various categories of sources, including chemical plants, oil refineries, and vehicles.
The Clean Air Act has been instrumental in reducing air pollution and improving air quality over the past few decades. Between 1970 and 2020, the combined emissions of six common pollutants (PM2.5, PM10, SO2, NOx, VOCs, CO, and Pb) dropped by 78%. This has led to dramatic improvements in the quality of the air we breathe. For example, between 1990 and 2020, national concentrations of air pollutants improved by 73% for carbon monoxide, 86% for lead, 61% for annual nitrogen dioxide, 25% for ozone, 26% for 24-hour coarse particle concentrations, 41% for annual fine particles, and 91% for sulfur dioxide.
However, despite this progress, air pollution levels have increased nationally since 2016, reversing the previous trend of cleaner air. Between 2016 and 2018, fine particulate pollution increased by 5.5% on average across the country. This increase has been associated with nearly 10,000 additional premature deaths during that time. Researchers have suggested that a decrease in enforcement of the Clean Air Act may have contributed to this recent rise in pollution. The Trump administration, for example, attempted to weaken or not enforce clean air standards to placate the dirty energy industry.
While the Clean Air Act has been credited with improving air quality, it is important to note that enforcement and compliance are crucial to its success. The EPA and state governments play a vital role in ensuring that the standards and regulations set by the Clean Air Act are implemented and maintained. Without proper enforcement, the progress made in improving air quality may be jeopardized, and the health and welfare of the public may be at risk.
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Air pollution is the leading environmental cause of premature death, with 9 million deaths per year
Air pollution is a significant global issue, impacting the health and well-being of people worldwide, particularly in low- and middle-income countries. While air quality has improved in some regions, with a decrease in emissions of common air pollutants, air pollution remains a pressing concern, causing approximately 6.7 million premature deaths annually.
According to the World Health Organization (WHO), air pollution is responsible for 6.7 million premature deaths each year. This figure includes deaths attributed to both ambient (outdoor) air pollution and household air pollution. Ambient air pollution, caused by sources such as vehicle exhaust, industrial emissions, and the burning of fossil fuels, contributes to cardiovascular and respiratory diseases and cancers. Household air pollution, resulting from the use of polluting fuels for cooking and heating, also has severe health impacts, particularly in low-income countries.
Recent studies indicate a concerning trend in air pollution levels since 2016, with a reversal of the previous decade's progress towards cleaner air. Fine particulate pollution, known as PM2.5, increased by approximately 5% between 2016 and 2018 in the United States, leading to nearly 10,000 additional premature deaths. PM2.5 particles are extremely small, measuring less than 2.5 micrometers in diameter, and can cause serious health issues, including asthma, respiratory inflammation, lung cancer, heart attacks, and strokes.
The impact of air pollution on children's health is particularly alarming. UNICEF estimates that in 2021, exposure to air pollution led to over 700,000 deaths of children under five years old globally, making it the second-leading risk factor for death in this age group, after malnutrition. Pneumonia, asthma, premature birth, and low birth weight are among the health issues linked to air pollution exposure in young children. The inequities are stark, with the air pollution-linked death rate in children under five in Africa being 100 times higher than in high-income countries.
While there has been a general decline in global death rates from total air pollution in recent decades, this improvement is primarily driven by a reduction in indoor air pollution. Outdoor air pollution remains a significant challenge, especially as countries industrialize and experience an increase in outdoor air pollution levels. Addressing air pollution is crucial to protect public health, and concerted efforts by policymakers and stakeholders across various sectors, including energy, transport, waste management, and urban planning, are necessary to mitigate this pressing issue.
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Deaths from modern forms of pollution have risen 66% since 2000, driven by industrialisation
While air quality has improved in many countries since 1980, pollution remains a significant global issue. In 2015, pollution was responsible for an estimated 9 million deaths worldwide, making it the leading environmental cause of premature mortality. Since then, deaths from modern forms of pollution, such as ambient air pollution and toxic chemical pollution, have risen by 66% since 2000 and by 7% since 2015. This increase is driven by industrialization, uncontrolled urbanization, population growth, fossil fuel combustion, and inadequate chemical policies.
Industrialization and economic development have led to a shift from indoor to outdoor pollution as the primary cause of deaths. In recent decades, death rates from total air pollution have declined by nearly half since 1990, primarily due to improvements in indoor air quality. However, this progress is offset by increasing outdoor air pollution as countries industrialize and transition from low to middle incomes. Outdoor air pollution is influenced by factors such as energy consumption, vehicle use, and industrial activity.
The health impacts of modern pollution are significant. Air pollution is a risk factor for leading causes of death, including heart disease, stroke, respiratory infections, lung cancer, diabetes, and chronic obstructive pulmonary disease (COPD). Lead poisoning and other types of chemical pollution also contribute to mortality, with certain chemicals in commercial use not adequately tested for safety. The burden of pollution-related deaths is disproportionately higher in low and middle-income countries, where industrialization and urbanization are more rapid.
Despite the alarming trends, there is a lack of sufficient action to address the issue. Efforts to improve air quality have been made, such as the Clean Air Act, which improved air quality and saved lives. However, a decrease in the enforcement of such regulations has been linked to the recent rise in pollution levels. To mitigate the increasing deaths from modern pollution, a stronger focus on prevention and mitigation strategies is necessary, along with the implementation of adequate national and international chemical policies.
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Carbon dioxide emissions have increased every decade since the 1960s, driven by human activity
Carbon dioxide emissions have been increasing at an alarming rate since the 1960s, and human activity is a significant driver of this trend. The burning of fossil fuels, such as coal and oil, has led to a rapid increase in carbon dioxide levels in the atmosphere. According to the Global Carbon Budget 2024, annual carbon dioxide emissions from fossil fuel combustion were close to 11 billion tons per year in the 1960s. However, by 2024, this number had skyrocketed to an estimated 37.4 billion tons. This represents a concerning acceleration in emissions growth over the decades.
The Industrial Revolution marked a turning point in atmospheric carbon dioxide levels. Since 1750, human activities have consistently added carbon dioxide to the atmosphere, with emissions rising steadily to about 5 gigatons by the middle of the 20th century. The period between the 1950s and the 1980s witnessed a rapid increase, culminating in emissions surpassing 35 billion tons annually by the century's end. This trend was predominantly influenced by industrialization and population growth, particularly in the United States and Europe.
While there have been temporary dips in emissions due to historical events such as the Great Depression and World War II, the overall trajectory has been consistently upward. The United States, the European Union, and, more recently, countries in East Asia and the Pacific, have been major contributors to cumulative emissions. Population growth, economic development, and energy use are among the primary drivers of increasing emissions.
The consequences of these rising emissions are evident in the changing atmospheric carbon dioxide levels. In the 1960s, atmospheric carbon dioxide concentrations increased by about 0.8 parts per million (ppm) annually. This growth rate accelerated in subsequent decades, reaching 1.6 ppm per year in the 1980s and remaining at similar levels in the 1990s. The latest data from 2024 reveals a new record high, with global average atmospheric carbon dioxide concentrations reaching 422.8 ppm.
Despite some improvements in air quality over the years, the impact of human activities on carbon dioxide emissions and, consequently, atmospheric carbon dioxide levels, is undeniable. If the current trends continue, with global energy demands rising and fossil fuels remaining the primary source of energy, atmospheric carbon dioxide concentrations could reach unprecedented levels. Addressing this challenge requires a concerted effort to transition to cleaner energy sources and implement measures to reduce carbon dioxide emissions.
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Frequently asked questions
According to the US EPA, total emissions of the six principal air pollutants dropped by 78% between 1970 and 2023. However, since 2010, there has been a reversal of this trend, with fine particulate pollution increasing by 5.5% between 2016 and 2018.
Researchers have identified several factors contributing to the increase in pollution since 2010, including rising natural gas use, increased driving, and a decrease in enforcement of the Clean Air Act.
The increase in fine particulate pollution has been associated with negative health outcomes such as respiratory problems, asthma, lung cancer, heart attacks, and strokes. It is estimated that the increase in pollution between 2016 and 2018 led to nearly 10,000 additional premature deaths.
Sources of data for analyzing pollution trends include the US EPA, which tracks emissions data from various pollution sources, and media outlets, which have shown a steadily rising trend in coverage of pollution topics since 2010.
The main pollutants of concern that have increased since 2010 include fine particulate matter (PM2.5), ambient air pollution, lead pollution, and toxic chemical pollution. These modern forms of pollution require major increases in mitigation and prevention efforts.
