Meghan Hodges
The Clean Air Act requires the EPA to set National Ambient Air Quality Standards (NAAQS) for six commonly found air pollutants known as criteria air pollutants. These pollutants are found all over the United States and can harm human health, the environment, and cause property damage. The EPA designates these pollutants as criteria air pollutants because it regulates them by developing human health-based and/or environmentally based criteria for setting permissible levels. These criteria serve as science-based guidelines to address environmental problems such as acid rain, ozone depletion, and particle pollution. State, local, and tribal agencies work together with the EPA to develop emission reduction strategies, plans, and programs to attain and maintain the NAAQS throughout the country.
| Characteristics | Values |
|---|---|
| Number of pollutants | Six |
| Pollutants | Particle pollution, ground-level ozone, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead |
| Harm | To human health, the environment, and property |
| Standards | National Ambient Air Quality Standards (NAAQS) |
| Units of measure | Parts per million (ppm) by volume, parts per billion (ppb) by volume, and micrograms per cubic meter of air (µg/m3) |
| Tracking | Air concentrations and emissions |
| Compliance programs | New Source Review (NSR), RACT/BACT/LAER Clearinghouse (RBLC), Air Enforcement |
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What You'll Learn
The Clean Air Act
To achieve compliance with the NAAQS, the EPA has established various programs and regulations. One key program is the New Source Review (NSR) program, which is a preconstruction review process for new and modified stationary sources of pollution. The EPA also runs the Clean Air Markets Division (CAMD), which manages programs aimed at reducing air pollution from power plants to address environmental problems such as acid rain, ozone depletion, and particle pollution.
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National Ambient Air Quality Standards (NAAQS)
The Clean Air Act requires the Environmental Protection Agency (EPA) to set National Ambient Air Quality Standards (NAAQS) for six principal pollutants, commonly referred to as "criteria pollutants". These pollutants are widespread in outdoor air and are considered harmful to public health and the environment. The six criteria air pollutants are: ozone (O3), atmospheric particulate matter (PM2.5/PM10), lead (Pb), carbon monoxide (CO), sulfur oxides (SOx), and nitrogen oxides (NOx). These pollutants are typically emitted from a variety of sources, including industry, mining, transportation, electricity generation, and agriculture.
The NAAQS establishes two types of national air quality standards: primary and secondary. The primary standards are designed to protect the health of 'sensitive' populations, such as asthmatics, children, and the elderly, with an adequate margin of safety. These standards aim to safeguard public health by reducing the impact of pollutants on vulnerable individuals. On the other hand, the secondary standards are focused on protecting the environment and public welfare. These standards address issues such as visibility, damage to crops, vegetation, buildings, and animals, as well as other adverse effects on the environment.
To achieve compliance with the NAAQS, the EPA employs various programs and strategies. One key program is the New Source Review (NSR) program, which involves a preconstruction review process for new and modified stationary sources of pollution. Additionally, the EPA maintains a database called the RACT/BACT/LAER Clearinghouse (RBLC), which contains information on the best available air pollution control technologies. This database helps identify effective measures to reduce emissions from stationary sources.
The EPA periodically reviews and revises the NAAQS as needed. For example, in 1996, the EPA considered implementing a new NAAQS for 5-minute peaks of SO2 affecting sensitive populations, but ultimately decided to maintain the existing standards. In 2010, the EPA replaced the dual primary standards with a new 1-hour standard, and in 2012, the EPA reaffirmed the existing NAAQS. While states may have stronger air pollution laws, they cannot set pollution limits weaker than those established by the EPA. The NAAQS plays a crucial role in ensuring that the air quality across the country meets the necessary standards to protect public health and the environment.
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Health and environmental impact
The Clean Air Act requires the US Environmental Protection Agency (EPA) to set National Ambient Air Quality Standards (NAAQS) for six common air pollutants known as criteria air pollutants. These pollutants are found all over the United States and can harm human health and the environment, as well as cause property damage. The six criteria air pollutants are:
- Particle pollution
- Ground-level ozone
- Carbon monoxide
- Sulfur dioxide
- Nitrogen dioxide
- Lead
Particle pollution and ground-level ozone are the most widespread health threats among the six criteria air pollutants. The EPA develops human health-based and environmentally based criteria (science-based guidelines) for setting permissible levels of these pollutants. The units of measure for the standards are parts per million (ppm) by volume, parts per billion (ppb) by volume, and micrograms per cubic meter of air (µg/m3).
The EPA's Clean Air Markets Division (CAMD) runs programs that reduce air pollution from power plants to address environmental problems such as acid rain, ozone, particle pollution, and the interstate transport of air pollution. The New Source Review (NSR) program is a preconstruction review process for new and modified stationary sources of air pollution. The RACT/BACT/LAER Clearinghouse (RBLC) is a database with case-specific information on the "Best Available" air pollution control technologies that have been required to reduce emissions from stationary sources.
States are required to develop general and specific plans to attain and maintain the NAAQS in all areas of the country. State, local, and tribal agencies use information on the health and environmental effects of the criteria air pollutants to develop emission reduction strategies, plans, and programs to assure they attain and maintain the NAAQS. Despite the progress made in the last 30 years, millions of people still live in counties with monitored concentration data showing unhealthy air for one or more of the six criteria air pollutants.
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State and tribal involvement
The Clean Air Act requires the Environmental Protection Agency (EPA) to set National Ambient Air Quality Standards (NAAQS) for six common air pollutants known as criteria air pollutants. These pollutants are found all over the United States and can harm human health, the environment, and cause property damage. The six criteria air pollutants include particle pollution, ground-level ozone, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead.
Individual states or tribes may have stronger air pollution laws, but they cannot set pollution limits that are weaker than those established by the EPA. The EPA provides guidance and support to states and tribes, ensuring a consistent and effective approach to addressing air pollution. The EPA's Clean Air Markets Division (CAMD) runs programs that specifically target air pollution from power plants, addressing issues such as acid rain, ozone depletion, and particle pollution, including their interstate transport.
The EPA also tracks air pollution trends for each of the six criteria air pollutants, monitoring both air concentrations through measurements at selected sites across the country and emissions based on engineering estimates of total annual pollution releases. This data is invaluable for states and tribes in understanding the scope and scale of the problem, allowing them to develop effective strategies to combat air pollution and protect the health and well-being of their citizens.
Despite progress over the last 30 years, millions of people still reside in counties with unhealthy air quality concerning one or more of the six criteria air pollutants. Continuous collaboration between the EPA, states, tribes, and local agencies is essential to addressing this ongoing challenge and ensuring that all communities across the nation breathe cleaner air.
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Compliance and enforcement
EPA's Role in Compliance and Enforcement
The EPA is responsible for setting and enforcing the NAAQS for criteria air pollutants, which include particle pollution, ground-level ozone, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead. These pollutants are designated as criteria air pollutants because the EPA regulates them by establishing limits based on scientific, health-based, and environmental criteria.
Compliance Strategies
To achieve compliance with the NAAQS, the EPA works collaboratively with state, tribal, and local air agencies. They develop strategies, plans, and programs to reduce emissions and improve air quality. The New Source Review (NSR) program is a key initiative, involving a preconstruction review process for new and modified stationary sources of air pollution. Additionally, the RACT/BACT/LAER Clearinghouse (RBLC) database provides information on the best available air pollution control technologies, assisting industries in reducing emissions.
Enforcement Actions
The EPA's enforcement efforts focus on ensuring that sources of air pollution comply with the NAAQS and taking action against violations. This includes monitoring and evaluating air pollution trends through actual measurements at monitoring sites and engineering estimates of total pollutant emissions. When areas are designated as ""nonattainment" for a particular pollutant, the EPA works with state and tribal agencies to develop specific plans to attain the standards. Enforcement actions can include fines, penalties, and legal actions to compel compliance.
State and Tribal Authority
While the EPA sets the minimum standards, individual states and tribes may have stronger air pollution laws and regulations. They play a crucial role in implementing and enforcing the NAAQS within their jurisdictions. This includes developing emission reduction strategies and ensuring that local sources of air pollution comply with the standards.
Continuous Improvement
The EPA continuously evaluates and updates the NAAQS to reflect the latest scientific and health-based evidence. For example, the previous SO2 standards remain in effect in certain areas until new implementation plans are approved, demonstrating a dynamic approach to ensuring effective compliance.
In summary, compliance and enforcement of the NAAQS for criteria air pollutants are critical to safeguarding public health and the environment. The EPA, along with state, tribal, and local partners, plays a pivotal role in setting standards, tracking pollution trends, and taking enforcement actions to ensure continuous improvement in air quality across the United States.
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Frequently asked questions
Criteria air pollutants are six common air pollutants found all over the United States. They include particle pollution, ground-level ozone, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead. These pollutants can harm human health, the environment, and cause property damage.
The U.S. Clean Air Act requires the EPA to set National Ambient Air Quality Standards (NAAQS) for criteria air pollutants. The EPA develops human health-based and environmentally-based criteria for setting permissible levels of these pollutants.
The EPA tracks two types of air pollution trends for each pollutant: air concentrations through measurements at monitoring sites and emissions through engineering estimates. The EPA also runs programs to reduce air pollution from power plants, addressing issues such as acid rain and interstate pollution. State, local, and tribal agencies work with the EPA to develop strategies and plans to attain and maintain NAAQS.
