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Air Quality |
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Maintenance and nonattainment areas |
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DEQ Home > Air Quality > Maintenance and nonattainment areas | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Air pollutantsThe U.S. Environmental Protection Agency (EPA) set national air quality standards for six common pollutants (also referred to as "criteria" pollutants. These standards, known as National Ambient Air Quality Standards (NAAQS) consist of:
*Secondary standards set limits to protect public welfare, including protection against decreased visibility, damage to animals, crops, vegetation, and buildings. Maintenance and nonattainment areas in OregonMaintenance areas are those geographic areas that had a history of nonattainment, but are now consistently meeting the National Ambient Air Quality Standard (NAAQS). Maintenance areas have been re-designated by EPA from "nonattainment" to "attainment with a maintenance plan," or designated by the Environmental Quality Commission. Legal descriptions of these areas are listed in Oregon Administrative Rules, Chapter 340, Division 204-0010. Nonattainment means that a geographic area has not consistently met the clean air levels set by the U.S. Environmental Protection Agency in the National Ambient Air Quality Standards (NAAQS). Legal descriptions of these areas are available in Oregon Administrative Rules, Chapter 340, Division 204-0010. New PM2.5 Standards |
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For more information about Air Quality call 503-229-5359 or . |
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