Meghan Hodges
The United States Environmental Protection Agency (EPA) is the primary source of information on pollution in the country. The EPA works with state, local, and tribal governments, as well as other federal agencies and stakeholders, to monitor and regulate pollution levels. They track a range of emissions data, including common air pollutants and their precursors, through measurements from monitors located across the country. The EPA also has the authority to add known or suspected pollutants that cause cancer or other adverse health and environmental effects to the Clean Air Act, which currently lists 187 hazardous air pollutants.
| Characteristics | Values |
|---|---|
| Air quality trends | Created by the EPA using measurements from monitors located across the country |
| Air quality data sources | State and local air agencies, tribes, and industry |
| Air quality data | How much of each pollutant is emitted from various pollution sources |
| Pollutant sources | Vehicles, factories, and other sources |
| Emission estimates factors | Levels of industrial activity, technological developments, fuel consumption, vehicle miles traveled, and other human activities |
| Emission reduction | The EPA has acted to dramatically improve America's air quality by designing and developing national programs that, when fully implemented, will achieve significant reductions in air emissions |
| Emission reduction factors | Federal and state implementation of stationary and mobile source regulations, and technological advancements |
| Clean Air Act | The EPA continues to work with state, local and tribal governments, other federal agencies, and stakeholders to reduce air pollution and its effects |
| Hazardous air pollutants | Benzene, perchloroethylene, methylene chloride, dioxin, asbestos, cadmium, mercury, chromium, lead compounds, and more |
| Pollutant sources | Motor vehicles, industrial facilities, power plants, chemical manufacturing, aerospace manufacturing, steel mills, and more |
| Nonpoint source pollution | Septic tanks, cars, trucks, boats, farms, ranches, forest areas, motor vehicle engines, and more |
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What You'll Learn
The US EPA and its programs
The US Environmental Protection Agency (EPA) is responsible for protecting human health and safeguarding the natural environment, including air, water, and land. The EPA implements environmental laws written by Congress by creating regulations and setting national standards that states and tribes enforce through their own regulations. The EPA also enforces these regulations and helps companies understand the requirements. The EPA's budget includes grants to state environmental programs, non-profits, and educational institutions for projects like scientific studies and community cleanups.
The EPA has laboratories across the nation that identify and address environmental problems, sharing information with other countries, private sector organizations, academic institutions, and other agencies. The EPA also works with state and local air agencies, tribes, and industry to develop emissions information, tracking data on the amount of each pollutant emitted from various sources. The EPA has developed statistical approaches to understand the influence of weather on emissions and air quality, helping to evaluate the effectiveness of emission reduction programs.
The EPA has various programs and initiatives to improve air and water quality. For example, the Clean Power Plan aimed to reduce emissions from power plants, while the WaterSense program encourages water efficiency through special labels on consumer products. The EPA also addresses water pollution through the National Pollutant Discharge Elimination System (NPDES) permit program, which regulates point sources discharging into US waters. In addition, the EPA has standards for radiation in air and drinking water and works to remediate contaminated sites.
The EPA has faced some controversies, including delays in reporting auto companies' use of loopholes and its refusal to allow some states to raise fuel economy standards. However, the EPA has also taken action against violations, such as in the case of Volkswagen Group's illegal emissions. Overall, the EPA plays a crucial role in protecting public health and the environment in the US.
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Air pollution data and statistics
US Environmental Protection Agency (EPA)
The EPA is a government agency responsible for monitoring and regulating air quality at the national level. They collect data on a range of air pollutants, including particulate matter, ozone, lead compounds, and air toxics. The EPA utilizes a network of monitors located across the country to gather real-time data on pollutant concentrations. This data is then used to create air quality trends and estimates of nationwide emissions. The EPA's Air Emissions Sources site provides access to national, state, and local emissions summary data.
The EPA has reported significant improvements in air quality over the years. Between 1980 and 2005, airborne lead concentrations decreased by 98% due to the phase-out of leaded gasoline and the implementation of air toxics programs. From 1990 to 2017, emissions of air toxics declined by 74%, attributed to federal and state regulations and technological advancements. Despite this progress, approximately 140 million people lived in counties with pollution levels above the primary National Ambient Air Quality Standards (NAAQS) in 2023.
American Lung Association – “State of the Air” Report
The American Lung Association publishes an annual report titled "State of the Air," which analyzes air quality data collected by federal, state, local, and Tribal governments at official monitoring sites across the United States. The report focuses on two of the most dangerous air pollutants: fine particles and ozone. It assigns grades to metropolitan areas and counties based on daily and long-term measures of particle pollution and ozone levels.
The 2025 report highlights that Bakersfield, California, has the worst short-term and year-round particle pollution, while Los Angeles continues to rank as the city with the worst ozone pollution. It also emphasizes the disproportionate impact of air pollution on communities of color, who are more vulnerable due to higher rates of chronic conditions.
AirNow.gov
AirNow.gov is a website that provides real-time air quality information to the public. It utilizes the Air Quality Index (AQI) to present current air quality data for ozone and particulate matter. The website offers interactive maps, allowing users to search for air quality data based on geographic locations. AirNow.gov also provides alerts, such as wildfire smoke impacting multiple states, to help people stay informed about air quality conditions in their areas.
The United States has multiple sources of air pollution data and statistics, with organizations like the EPA, American Lung Association, and AirNow.gov playing vital roles in collecting, analyzing, and disseminating this information. These data sources help track the country's progress in improving air quality, identify areas of concern, and guide policy decisions to protect public health and the environment.
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Hazardous air pollutants
The EPA uses hazardous air pollutant emissions and ambient monitoring data to develop regulatory programs that limit emissions from stationary sources. The EPA establishes an Air Quality Index (AQI) for the five major air pollutants regulated by the Clean Air Act. The AQI is a tool for communicating about outdoor air quality and health, with six colour-coded categories, each corresponding to a range of index values. An AQI value of 50 or below represents good air quality, while a value over 300 represents hazardous air quality.
The EPA creates air quality trends using measurements from monitors located across the country. These measurements include levels of industrial activity, technological developments, fuel consumption, vehicle miles travelled, and other activities that cause air pollution. The EPA's air quality trends show that air quality based on concentrations of common pollutants has improved nationally since 1980. For example, as a result of the phase-out of leaded gasoline and controls on emissions of lead compounds through the EPA's air toxics program, airborne lead concentrations in the US decreased by 98% between 1980 and 2005.
Despite this progress, approximately 140 million people nationwide lived in counties with pollution levels above the primary National Ambient Air Quality Standards (NAAQS) in 2023. Air pollution is a significant issue, contributing to one in ten deaths globally each year. It is a risk factor for many leading causes of death, including heart disease, stroke, lower respiratory infections, lung cancer, diabetes, and chronic obstructive pulmonary disease (COPD).
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Sources of ocean pollution
Ocean pollution refers to the contamination of ocean water and ecosystems by physical, chemical, or biological agents that can cause harm to humans and marine species. It is a significant issue that threatens the health and sustainability of our oceans and the diverse life they support. The sources of ocean pollution are diverse and interconnected, and understanding them is crucial for devising effective strategies to combat this global challenge.
One of the primary sources of ocean pollution is land-based activities. Approximately 80% of marine pollution originates from land sources. This includes runoff from nonpoint sources such as septic tanks, vehicles, farms, and forest areas. Vehicles, for instance, leak small amounts of oil onto roads and parking lots, which eventually find their way into water bodies and, ultimately, the ocean. Similarly, dirt, topsoil, and silt from fields and construction sites can wash into waterways, harming fish and wildlife habitats and degrading water quality for marine species and humans alike.
Marine sources also contribute significantly to ocean pollution. Abandoned fishing gear, including nets, lines, ropes, and vessels, accounts for a substantial portion of marine plastic pollution. For instance, in the Great Pacific Garbage Patch, plastic lines, ropes, and fishing nets constitute 52% of the plastic mass. Additionally, economic sectors such as tourism and retail contribute to marine plastic pollution. The building of infrastructures and the creation of services in the tourism industry have led to increased plastic pollution, notably accounting for about 40% of the plastic pollution in the Mediterranean Sea.
River systems play a crucial role in transporting plastic pollution from land to the ocean. While some of the world's largest rivers, like the Yangtze, Ganges, and Amazon, are significant contributors, smaller rivers also play a more considerable role than previously thought. This is particularly true for rivers with large populations and poor waste management practices. To effectively address ocean plastic pollution, a comprehensive approach is necessary, focusing on improving waste management practices and reducing plastic waste globally.
Lastly, ocean pollution can also originate from atmospheric sources. Air pollution, such as emissions from vehicles, factories, and industrial activities, can settle into waterways and oceans, contributing to water pollution. While air quality has improved in recent decades due to regulatory measures and technological advancements, it remains a concern, especially with the persistent presence of pollution hotspots across the nation.
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Air quality improvement initiatives
Air pollution is a leading risk factor for death, contributing to one in ten deaths globally in recent years. While air quality has improved in the United States since 1980, approximately 140 million people nationwide lived in counties with pollution levels above the primary NAAQS in 2023.
To further improve air quality, the EPA has implemented various initiatives and regulations. For instance, the Clean Air Act has achieved dramatic reductions in air pollution, preventing hundreds of thousands of serious health effects annually. The Act has led to improvements in motor vehicle fleet cleanliness, resulting in significant reductions in carbon monoxide concentrations and other pollutants.
The EPA has also established the "NOx SIP Call" Rule, which included a NOx Budget Trading Program for the eastern United States from 2003 to 2008. This program successfully cut summertime NOx emissions from power plants by 62% from 2000 levels. The Clean Air Interstate Rule (CAIR) has further reduced power plant emissions of SO2 and NOx, contributing to the attainment of air quality standards in almost all areas in the East.
Additionally, the EPA's acid rain program, interstate air pollution rules, motor vehicle rules, and diesel sulfur rules have significantly reduced sulfur dioxide and nitrogen oxide emissions, improving visibility in national parks and wilderness areas.
Beyond federal initiatives, individuals can also play a role in improving air quality. The UN Environment Programme (UNEP) suggests several actions, including managing waste properly, composting, recycling, reusing bags, using public transportation or bicycles, conserving energy, and supporting policies that strengthen emissions standards. Missouri's Department of Natural Resources also encourages residents to reduce vehicle emissions by carpooling, using public transportation, or maintaining their vehicles' emissions control systems.
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Frequently asked questions
The US Environmental Protection Agency (EPA) is the primary source of information on pollution in the US. The EPA works with state, local and tribal governments, other federal agencies, and stakeholders to gather data on pollution and reduce its impact.
The EPA uses a combination of monitored readings and engineering calculations to estimate emissions of ambient air pollutants and their precursors. These calculations take into account factors such as industrial activity, technological developments, fuel consumption, and vehicle miles traveled.
According to the EPA, outdoor air pollution is largely caused by motor vehicles, industrial facilities, power plants, and manufacturing processes. Indoor air pollution arises from a variety of sources, including solid fuels used for cooking.
Since 1970, the US has made significant progress in reducing air pollution. For example, airborne lead concentrations decreased by 98% between 1980 and 2005, and emissions of air toxics declined by 74% from 1990 to 2017. However, climate change and extreme weather events have made it increasingly challenging to maintain these improvements.
The EPA has implemented various initiatives to reduce air pollution, including the National Clean Diesel Campaign, Clean School Bus USA, and the National Gas STAR Methane Challenge Program. The Clean Air Act, first published in 2000, has also played a crucial role in reducing emissions from transportation, power plants, and manufacturing.
