Brian Barton
Americans' daily pollution output is a pressing issue, with approximately 66 million tons of pollution emitted into the atmosphere in 2023. This figure includes emissions from various sectors, such as industry, commercial and residential activities, agriculture, and transportation. While air quality has improved since 1980, about 64 million Americans lived in counties with failing grades for daily spikes in particle pollution in 2023. The primary greenhouse gas emitted by human activities, carbon dioxide, has seen a 2% decrease in emissions from 1990 to 2022. However, economic activity, population growth, and other factors continue to influence pollution levels.
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What You'll Learn
Greenhouse gas emissions
To improve air quality and reduce emissions, the Environmental Protection Agency (EPA) has designed and developed national programs. Federal and state regulations, technological advancements, and structural changes in the economy have also contributed to a decrease in emissions. However, the Trump administration has taken steps to loosen restrictions on air pollution and undermine climate research, which may hinder progress in reducing greenhouse gas emissions.
It is important to note that the data on greenhouse gas emissions may not include all gases and substances that contribute to climate change. Additionally, the closure of monitoring stations, such as the proposed closure of a NOAA observatory in Hawaii, may impact the ability to collect scientific data and understand the effects of greenhouse gases on the environment.
Overall, Americans' daily activities contribute significantly to greenhouse gas emissions, and efforts to reduce these emissions are crucial in mitigating climate change.
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Fossil fuel combustion
Fossil fuels, including coal, crude oil, and natural gas, are formed from the fossilized, buried remains of plants and animals. They have been used for over a century to generate energy, and even today, they serve about 80% of our energy needs. Oil, coal, and gas are burned to meet our energy requirements, but they also contribute to the current global warming crisis.
The combustion of fossil fuels releases a myriad of toxic air pollutants, including nitrogen oxides, which contribute to the formation of smog and acid rain. Excess nitrogen in the atmosphere is deposited back onto the land and washes into nearby water bodies, causing harmful algal blooms and oxygen-deprived aquatic zones, which are toxic to aquatic life.
In addition to nitrogen oxides, the burning of fossil fuels emits ammonia, which is primarily associated with agricultural activities, but also has fossil fuel origins. The transportation sector, including cars and trucks, is a significant contributor to nitrogen oxide emissions.
To address these issues, interventions such as the India Heat Action Plan have been implemented, and the International Energy Agency emphasizes the availability of technologies to reduce air pollution levels. Increasing the use of low-emission fuels, renewable energy sources, and improving energy efficiency are crucial steps towards reducing pollution and greenhouse gas emissions.
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Air toxics
Hazardous air pollutants, also known as air toxics, are substances that are known or suspected to cause cancer, birth defects, and other serious health issues. The U.S. Environmental Protection Agency (EPA) has classified 188 pollutants as hazardous, including gases such as hydrogen chloride, benzene, and toluene, and compounds and metals such as asbestos, cadmium, mercury, and chromium. These pollutants can be released into the air through various sources, including emissions from coal-fired power plants, industries, refineries, vehicles, and chemical releases from accidents at industrial facilities.
According to the EPA, between 1990 and 2017, emissions of air toxics in the United States declined by 74%. This decrease is largely attributed to federal and state regulations on stationary and mobile sources, as well as technological advancements. Despite this progress, approximately 140 million people in the U.S. lived in counties with pollution levels above the primary National Ambient Air Quality Standards (NAAQS) in 2023.
The EPA has made significant efforts to address air toxics and improve air quality. They have developed the Air Toxics Screening Assessment, or AirToxScreen, which uses emissions and weather data to estimate the health risks associated with toxic air pollutants. Additionally, the Clean Air Act requires the EPA to regulate hazardous air pollutants from industrial facilities in two phases. The EPA utilizes emissions and ambient monitoring data to create regulatory programs that aim to limit emissions from stationary sources.
While the EPA's actions have led to notable reductions in air toxics, there is still work to be done. In 2023, about 64 million Americans lived in counties with failing grades for daily spikes in particle pollution. This issue is primarily driven by emissions from vehicles, factories, and other sources. To address this challenge, the EPA tracks a range of emissions data, including the types and amounts of pollutants emitted by various sources, and develops programs to achieve significant reductions in air emissions.
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Ozone and particle pollution
Ground-level ozone is a "bad" ozone as it can trigger a variety of health problems, especially for children, the elderly, and people with lung diseases such as asthma. Breathing ozone irritates the lungs, causing inflammation. Ozone and particle pollution are also linked to an increased risk of premature birth and lower birth weight in newborns. In 2023, approximately 64 million Americans lived in counties with a failing grade for daily spikes in particle pollution. Climate change increases the risk of wildfires and the resulting smoke that spreads dangerous particle pollution.
Despite improvements in air quality over the years, approximately 140 million people nationwide lived in counties with pollution levels above the primary National Ambient Air Quality Standards (NAAQS) in 2023. The EPA has been working to improve air quality by creating state implementation plans (SIPs) to reduce emissions of pollutants that form ground-level ozone. These plans outline measures such as vehicle and transportation standards, regional haze and visibility rules, and regular reviews of the NAAQS.
The impact of climate change, however, has resulted in more frequent wildfires and higher temperatures, dry and sunny skies, and stagnation events, leading to an increase in unhealthy ozone days. While cleanup efforts of ozone precursor pollutants from industrial, power generation, and mobile sources have been working to reduce ozone concentrations, the effects of climate change present ongoing challenges for air quality in the United States.
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Carbon dioxide emissions
Carbon dioxide (CO2) is the primary greenhouse gas emitted through human activities. In 2022, CO2 accounted for 80% of all US greenhouse gas emissions from human activities. The combustion of fossil fuels is the largest source of greenhouse gas emissions in the US. Changes in emissions from fossil fuel combustion are influenced by factors such as population growth, economic growth, changing energy prices, new technologies, changing behaviour, and seasonal temperatures.
In 2022, US greenhouse gas emissions totalled 6,343 million metric tons (14.0 trillion pounds) of carbon dioxide equivalents, representing a 3.0% decrease since 1990. From 1990 to 2022, emissions of carbon dioxide, the primary greenhouse gas emitted by human activities, decreased by 2%. The decrease in emissions from 2019 to 2020 was largely due to the impacts of the COVID-19 pandemic on travel and economic activity. However, emissions increased from 2020 to 2022 by 5.7%, driven by an increase in carbon dioxide emissions from fossil fuel combustion as economic activity rebounded.
In 2024, US energy-related CO2 emissions declined overall by less than 1%, or 23 million metric tons. The most notable decreases occurred in the residential and industrial sectors. Lower residential sector emissions were mainly due to decreased consumption of natural gas and petroleum products associated with space heating. Decreases in industrial-sector emissions were linked to reduced manufacturing. Emissions from the commercial, transportation, and electric power sectors remained relatively unchanged.
While CO2 emissions come from various natural sources, human-related emissions are responsible for the increase in the atmosphere since the Industrial Revolution. Human activities have altered the natural carbon cycle by adding more CO2 to the atmosphere and impacting the ability of natural sinks, like forests and soils, to remove and store CO2. Land use, land-use change, and forestry practices can act as net sinks of CO2, removing and storing carbon in plants and trees. In 2022, these practices offset about 13% of total emissions in the US.
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Frequently asked questions
Americans create about 66 million tons of pollution daily.
Sources of pollution in the US include industrial activities, commercial and residential activities, agriculture, and land use and forestry.
The US emits various pollutants, including carbon dioxide, methane, nitrogen oxides, carbon monoxide, and volatile organic compounds.
Pollution in the US has generally decreased over time, with a 78% drop in the six principal air pollutants between 1970 and 2023. However, there have been recent annual increases, with emissions rising by 5.7% from 2020 to 2022.
Pollution has a significant impact on Americans, with approximately 140 million people living in counties with pollution levels above the primary NAAQS in 2023. Communities of color are disproportionately affected by pollution and are more vulnerable due to higher rates of asthma, diabetes, and heart disease.
