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Maintenance Areas in Oregon

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

Klamath Falls

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Under authority of the Lane Regional Air Protection Agency (LRAPA). Contact LRAPA for information on this area.​

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Under the 1990 Clean Air Act Amendments, the Rogue Valley (Jackson County, Ashland, Phoenix, Talent, Medford, Jacksonville, Central Point, White City, and Eagle Point) became a nonattainment area for particulate matter (PM10). These communities shared a common airshed, known as the Medford-Ashland Air Quality Maintenance Area. During the 1980s, particulate pollution in the AQMA reached some of the highest levels in the nation and violated the federal air quality health standards also known as National Ambient Air Quality Standard. This violation meant two things:
  1. DEQ needed to write a plan to bring the Medford-Ashland AQMA back into compliance with the standard; and
  2. Added restrictions would be placed on Rogue Valley communities to limit new and expanding industries and significant transportation projects would need to be reviewed to determine their compliance with the plan.
The plan and rules addressing industry and residential woodstove curtailment were prepared by DEQ in 1991. The Environmental Quality Commission adopted the plan and rules shortly thereafter. All emission reduction measures adopted by the EQC were successfully implemented and air quality monitoring in the AQMA demonstrated that the PM10 standards were met in 1992. The Medford-Ashland AQMA currently meets the PM10 standards and EPA’s tougher new standards for fine particulate (PM2.5).

On Dec. 10, 2004, the EQC approved an updated PM10 attainment and maintenance plans. This plan continues all of the PM10 strategies from the 1991 attainment plan and continues the strictest requirements for managing emissions growth from future new and expanding major industry under the New Source Review program. EPA approved the plans in 2005.

Supporting documents

​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. Legal descriptions of these areas are available in Oregon Administrative Rules, Chapter 340, Division 204-0010.​​

PM2.5

DEQ oversees the Oakridge PM2.5 Nonattainment Area, under the authority of the Lane Regional Air Protection Agency PM10

DEQ oversees the Oakridge PM10 Nonattainment Area, under the authority of the Lane Regional Air Protection Agency