There are many sources of air pollution, including automobiles, power plants, factories, small businesses and household products. Under the Clean Air Act, the EPA develops and enforces rules and regulations for all entities that emit toxic substances into the air. The Agency works with state, local and tribal governments, other federal agencies, businesses and community groups to implement and enforce its regulations. EPA also partners with scientists to study the causes and effects of pollution and to develop environmentally beneficial alternatives to pollution-generating processes.

Recommended EPA Web pages

• Air Pollution Emissions
  The Office of Air Quality Planning and Standards strives to assess the impacts of air pollution emissions and the results of efforts to curb these emissions.
• Air Quality Planning and Standards
  The Office of Air Quality Planning and Standards' primary mission is to preserve and improve air quality in the United States.
• Air Pollution Monitoring
  This site provides information and links to about air pollution monitoring in order to improve air quality.

Air Pollution
Certification Programs, Community Involvement, Industrial Air Pollution, New Source Review, Research, State Implementation Plans, Stationary Sources, Testing, Transboundary Pollution, Urban Air Pollution

Air Pollution Control
Abatement, Remediation, Treatment

Air Pollution Effects
Acid Rain, Climate Change, Economic Effects, Environmental Effects, Global Warming, Health Effects, Heat Island Effect, Risk Assessment

Air Pollution Legal Aspects
Compliance, Enforcement, Guidance, Legislation, Permits, Public Comment, Regulations, Reporting, Standards

Air Quality
Air Quality Criteria, Attainment, Early Action Compacts, Emission Factor, Emission Inventory, Emissions, Emissions Measurement, Emissions Trading, Measurement, Models, Monitoring, Nonattainment

Atmosphere
Carbon Sequestration, Climate Change, Global Warming, Ground Level Ozone, Ozone Depletion, Ozone Layer, Ozone Monitoring, Ozone Transport, Smog, Ultraviolet Radiation (UV)

Indoor Air Pollution
Building Related Illness, Carbon Monoxide, Environmental Tobacco Smoke, Fireplaces, Mercury, Mold, Radon, Sick Building Syndrome, Stoves, Vermiculite, World Trade Center Dust Cleanup

Mobile Sources
Airplanes, Automobiles, Diesels, Engines, Fuels, Inspection and Maintenance, Lawn and Garden Equipment, Locomotives, Marine Engines, Motorcycles, Trucks and Buses, Used Oil Recycling, Vehicle Emissions