Air Quality

Maintenance areas are those geographic areas that had a history of nonattainment, but are now consistently meeting the National Ambient Air Quality Standard. 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.

Maintenance areas in Oregon

  • Eugene-Springfield Air Quality Maintenance Area for Carbon Monoxide

Portland-Vancouver and Salem-Keizer area

Maintenance Plans



Oregon map for air quality maintenance areas
Oregon map for air quality maintenance areas.