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Map Layer Info

EPA Envirofacts Data - Air Releases

What this map layer shows:

The locations of more than 156,000 air emissions sites.
opens the U.S. Environmental Protection Agency home page
Background Information
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Air releases are sites where pollutants are released into the atmosphere from stationary sources, such as smokestacks and other vents at commercial or industrial facilities. This map layer was produced by the U.S. Environmental Protection Agency (EPA), which collects emissions information for six common air pollutants: carbon monoxide, lead, nitrogen dioxide, ozone, particulate matter, and sulfur dioxide. The EPA regulates these pollutants and establishes national air quality standards, as authorized by the 1970 Clean Air Act, to protect human health and prevent environmental and property damage. EPA air release information is stored in the Aerometric Information Retrieval System (AIRS).

By providing scientific research, expert studies, engineering designs, and money to support clean air programs, the EPA assists the States in complying with the Clean Air Act, which requires that each State have a plan for improving air quality in areas that do not meet national air-quality standards. The plan must include an inventory of existing sources of air pollution and an accurate estimate of the amount of pollutants each source emits. Individual States use EPA air emissions information to track the compliance status of point sources with various regulatory programs, to report air emissions estimates for pollutants regulated under the Clean Air Act, and to write State implementation plans for how to improve and maintain air quality.

The EPA Envirofacts Data - Air Releases map layer shows locations of more than 156,000 air emissions sites in the United States, Puerto Rico, and the U.S. Virgin Islands as of May, 2005. Descriptive information includes the facility name and identification number. More detailed information on air pollution is available from the EPA AirData page. The EPA National Ambient Air Quality Standards page has information on air quality standards, and definitions of environmental terms can be found in the EPA Terms of Environment.


Map Maker Sample
Air Releases
A Guide to Air Quality and Your Health