The EPA implements a number of programs intended to protect human health and the environment through specific attention to the earth's atmosphere. The Acid Rain Program focuses on obtaining emission reductions of sulfur dioxide (SO2) and nitrogen oxides (NOx). The Ozone Layer Protection program focuses on protection of ozone layer through achieving the phase-out of ozone-depleting substances. The Climate Protection program focuses on reducing greenhouse gas emissions through implementing voluntary, energy efficiency programs.

Recommended EPA Web pages

• Office of Atmospheric Programs (OAP)
  The mission of the Office of Atmospheric Programs is to protect human health and the environment through implementation of cross - cutting atmospheric programs.
• Global Atmospheric Protection
  Provides information about global atmospheric protection.
• Climate Change - Science: Atmosphere Changes
  Discusses the release of greenhouse gases and aerosols resulting from human activities and their effect on the atmosphere.

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