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Oregon Department of Environmental Quality

Air Quality

Maintenance and Nonattainment Areas 

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Maintenance Areas in Oregon 

Maintenance areas are 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 the U.S. Environmental Protection Agency (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.

Air Quality maintenance area
(Click to enlarge) Oregon map for air quality maintenance areas.

Eugene-Springfield Air Quality Maintenance Area for Carbon Monoxide

Grants Pass Central Business District Maintenance area for Carbon Monoxide and Urban Growth Boundary Maintenance area for PM10

Klamath Falls Urban Growth Boundary Maintenance area for Carbon Monoxide and PM10

La Grande Air Quality Maintenance area

Lakeview Air Quality Maintenance area

Medford-Ashland Area

Medford Area

Portland-Vancouver and Salem-Keizer Area

Maintenance Plans


Other References

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For more information about Air Quality call 503-229-5696

For reporting pollution problems contact Complaints

For technical assistance contact DEQINFO

Oregon Department of Environmental Quality
Headquarters: 700 NE Multnomah Street, Suite 600, Portland, OR 97232
Phone: 503-229-5696 or toll free in Oregon 1-800-452-4011
Oregon Telecommunications Relay Service: 1-800-735-2900  FAX: 503-229-6124

The Oregon Department of Environmental Quality is a regulatory agency authorized to protect Oregon's environment by
the State of Oregon and the Environmental Protection Agency.

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