Helena Joyce
The United States has been fighting pollution through various means since the 1970s, when the Environmental Protection Agency (EPA) began regulating air quality. The Clean Air Act, a federal law, has helped regulate emissions from different sources and set air quality standards. The EPA has also established minimum requirements for the ambient air quality monitoring system, with state and local agencies operating the monitors and reporting data. To reduce pollution, the EPA promotes pollution prevention (P2) practices, such as reducing waste generation, reusing materials, and adopting cleaner technologies. Additionally, the EPA has implemented regulations for transportation fuel and power plants to reduce greenhouse gas emissions and improve air quality. Despite these efforts, air pollution remains a significant issue, with transportation, industrial production, and electricity usage being major contributors.
| Characteristics | Values |
|---|---|
| Federal laws | Clean Air Act, Refined Coal Production Tax Credit |
| Agencies | Environmental Protection Agency (EPA), Minnesota Pollution Control Agency (MPCA), National Highway and Traffic Safety Administration, Forest Service, Department of the Interior |
| Strategies | Pollution prevention (P2), source reduction, education, guidance, incentives, voluntary partnership programs, regulatory programs, pre-construction permit programs, marketable pollution allowances, nitrogen oxides (NOx) Budget Program, nitrogen oxides (NOx) Budget Trading Program, Mercury and Air Toxics Standards |
| Actions | Reducing greenhouse gas emissions, reducing air pollution from vehicles, reducing air pollution from power plants, reducing mercury emissions from power plants, reducing nitrogen oxide emissions, reducing sulfur dioxide emissions, reducing fine particle pollution, improving energy efficiency, reducing oil imports, saving money, reducing wildfire risk, improving air quality monitoring |
| Recommendations | Using electric or hybrid vehicles, using efficient appliances and heating systems, turning off electrical items when not in use, burning only dry firewood, planting and caring for trees, using hand-powered or electric lawn equipment, limiting backyard fires, not burning garbage, carpooling, biking, taking the bus, telecommuting, keeping cars in good repair |
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What You'll Learn
The Clean Air Act
One of the goals of the Act was to set and achieve NAAQS in every state by 1975 to address the public health and welfare risks posed by certain widespread air pollutants. The setting of these pollutant standards was coupled with directing the states to develop state implementation plans (SIPs), applicable to appropriate industrial sources in the state, in order to achieve these standards.
Section 112 of the Clean Air Act addresses emissions of hazardous air pollutants. The 1990 Clean Air Act Amendments revised Section 112 to first require the issuance of technology-based standards for major sources and certain area sources. "Major sources" are defined as a stationary source or group of stationary sources that emit or have the potential to emit 10 tons per year or more of a hazardous air pollutant, or 25 tons per year or more of a combination of hazardous air pollutants. For major sources, Section 112 requires that the EPA establish emission standards that require the maximum degree of reduction in emissions of hazardous air pollutants.
Under the Clean Air Act, the EPA is taking steps to limit greenhouse gas pollution from large sources. The EPA and the National Highway and Traffic Safety Administration issued the first national greenhouse gas emission standards and fuel economy standards for cars and light trucks for model years 2012-2025, and for medium- and heavy-duty trucks for 2014-2018. The EPA is also responsible for developing and implementing regulations to ensure that transportation fuel sold in the United States contains a minimum volume of renewable fuel.
In 2015, President Obama and the EPA announced the Clean Power Plan – a step towards reducing carbon pollution from power plants and taking action on climate change. The Clean Power Plan provides national consistency, accountability and a level playing field while reflecting each state’s energy mix.
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Reducing vehicle emissions
The transportation sector is one of the largest sources of carbon pollution in the United States, with transportation activities accounting for 29% of total US emissions in 2021. Vehicle exhaust is a major source of air pollution, and there are several ways to reduce vehicle emissions.
Electric Vehicles
One way to reduce vehicle emissions is to encourage the use of electric vehicles. The US Environmental Protection Agency (EPA) has issued standards for greenhouse gas emissions and fuel economy for cars, light trucks, and medium-to-heavy-duty trucks. The EPA is also responsible for ensuring that transportation fuel sold in the US contains a minimum volume of renewable fuel. The Renewable Fuel Standard program aims to reduce greenhouse gas emissions and expand the nation's renewable fuels sector.
Reducing Fuel Consumption
The EPA and the Department of Transportation (DOT) have also set joint standards for GHG emissions and fuel economy, which are projected to cut 7 billion metric tons of GHG emissions over the lifetimes of vehicles sold between 2027 and 2032. These standards will also nearly double fuel efficiency, reduce America's dependence on oil, and provide savings for consumers.
SmartWay Program
The EPA's SmartWay program helps the freight transportation sector improve supply chain efficiency, reducing greenhouse gases and saving fuel costs for participating companies. The program has made significant gains in improving air quality and public health, and reducing the contribution of freight transportation to climate change.
State and Local Efforts
State and local agencies also play a key role in reducing vehicle emissions by investing in electric vehicle infrastructure and implementing activities to reduce transportation-related emissions. Some examples include setting reduction targets, estimating emissions, and analyzing the effects of transportation investments.
Individual Actions
Individuals can also play a part in reducing vehicle emissions by driving less, carpooling, biking, taking the bus, or telecommuting. Keeping vehicles in good repair and fixing exhaust and oxygen sensor problems can also help reduce emissions.
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Reducing industrial emissions
The United States has made significant progress in reducing air pollution since 1970, but air pollution continues to harm people's health and the environment. The US Environmental Protection Agency (EPA) has implemented various measures to reduce industrial emissions and combat climate change.
One of the key approaches is pollution prevention (P2), which aims to reduce or eliminate pollution at its source. In the industrial sector, P2 practices can include modifying production processes to generate less waste. For example, the EPA has set stricter emission standards for non-road diesel engines used in construction, agriculture, and industrial equipment, reducing emissions from these sources by more than 90%. The EPA has also regulated emissions from heavy-duty trucks, agricultural equipment, and construction machinery. Additionally, the EPA has worked with states to implement the Clean Power Plan, which aims to reduce carbon pollution from power plants and promote cleaner energy sources.
To further reduce industrial emissions, the EPA has taken steps to limit greenhouse gas pollution from large sources. Between 2010 and 2012, the EPA issued the first national greenhouse gas emission standards for cars and light trucks, followed by standards for medium and heavy-duty trucks. The EPA also requires pre-construction permits for large new stationary sources, such as power plants and refineries, to limit their greenhouse gas emissions.
The United States has committed to reducing methane emissions, which have significantly contributed to global warming since the Industrial Revolution. Existing technologies could cut a significant portion of the fossil fuel sector's methane emissions, and the Inflation Reduction Act was expected to make clean energy more economically attractive. However, political opposition and the push for more fossil fuel development present challenges to reducing industrial emissions and combating climate change.
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Encouraging citizens to cut back on emissions
The United States has made significant progress in reducing air pollution levels since the 1970s, when the Environmental Protection Agency (EPA) began regulating air quality. However, air pollution continues to be a threat to human health and the environment.
The Clean Air Act, as amended, establishes the legal framework for air quality management in the United States. Under this act, the EPA works with state, local, and tribal governments, other federal agencies, and stakeholders to reduce air pollution and its associated damage. The EPA also provides voluntary partnership programs to protect public health and the environment, reducing conventional air pollution, improving energy efficiency, and reducing oil imports.
To encourage citizens to cut back on emissions, the following steps can be taken:
- Educate citizens on the impact of emissions and provide guidance and incentives for reducing air pollution. This includes information on more sustainable alternatives, such as electric vehicles, carpooling, biking, and public transportation.
- Encourage citizens to reduce their energy consumption by choosing energy-efficient appliances and heating systems, as well as turning off electrical appliances when not in use.
- Promote the adoption of electric or hand-powered lawn equipment instead of gas-powered engines, which produce high levels of pollution.
- Implement a national system of marketable pollution allowances to cut power plant emissions, reducing acid rain and fine particle pollution.
- Provide incentives for citizens to switch to electric or hybrid vehicles, which can significantly reduce household emissions.
- Encourage the reuse of materials, such as drums and pallets, instead of disposing of them as waste, reducing the need for waste management and improving environmental protection.
- Support local businesses in complying with environmental rules and reducing waste and emissions through assistance programs.
- Promote tree planting and care, as trees filter pollutants, absorb carbon dioxide, and release oxygen into the atmosphere.
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The Mercury and Air Toxics Standards
The standards were established in 2011 after nearly 20 years of litigation by Earthjustice and other organisations. They were widely adopted by industry and have been successful in limiting dangerous air pollution. According to the Center for American Progress, mercury emissions from power plants dropped by 81.7% from 2011 to 2017.
MATS set technology-based emissions standards for mercury and other hazardous air pollutants (HAPs) emitted by units with a capacity of more than 25 megawatts. These standards are based on the levels achieved by the best-performing sources and apply to both existing and new units.
In addition to mercury, MATS targets other toxic substances such as arsenic, acid gases, hydrochloric acid, hydrogen fluoride, selenium, lead, and chromium. By reducing these pollutants, MATS has achieved significant health and environmental benefits. It is estimated that MATS prevents up to 11,000 premature deaths each year, including those of children, and has led to a dramatic reduction in mercury pollution, which can cause brain damage in babies.
Despite the success of MATS, there have been efforts to undermine or repeal certain amendments to the standards. In 2024, the EPA strengthened the Mercury and Air Toxics Standards, and in 2025, it proposed to repeal certain amendments finalised in 2024. The American Lung Association has strongly opposed these efforts, stating that lives and children's health depend on maintaining these successful limits on toxic pollution from power plants.
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Frequently asked questions
The Clean Air Act is a federal law that helps regulate emissions from different sources. It was established in 1970 and has helped reduce pollution as the U.S. economy has grown. It has allowed the Environmental Protection Agency (EPA) to pass air quality standards to protect public health and regulate the amount of greenhouse gas emissions.
The EPA has been working with state, local, and tribal governments, federal agencies, and stakeholders to reduce air pollution and its damage. They have issued national greenhouse gas emission standards for cars and trucks, and proposed truck standards for 2018 and beyond. The EPA also works with state and local agencies to manage the air quality monitoring system.
Pollution prevention practices, also known as P2 or source reduction, can be applied to all potential and actual pollution-generating activities. Examples include using electric lawn care equipment, using reusable water bottles, and modifying production processes to produce less waste.
To reduce air pollution, it is recommended to drive less, carpool, bike, bus, or telecommute. Keep your car well-maintained and turn off your engine when idling. You can also switch to using electric cars or hybrid vehicles, which can reduce household emissions by up to a quarter.
