Protecting Oregon's Environment
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Oregon Department of Environmental Quality

Eastern Region

Air Quality

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Klamath Falls Maintenance Plan

Klamath Falls was one of seven areas in Oregon that violated public health standards for particulate matter in Oregon based on data collected in the 1980's and was designated nonattainment by the Environmental Protection Agency (EPA). PM10 refers to particles in 10 microns in diameter and smaller. Particles of this size can lodge deep in the lungs for weeks and months and can aggravate asthma, heart disease and other circulatory and respiratory conditions.

DEQ studied Klamath Falls to assess its future air quality. DEQ in consultation with the community determined the need to continue efforts started in the 1990's to reduce particulate pollution such as PM10. A plan was prepared by DEQ in October 2002 and sent to EPA for approval. DEQ's plan, formally called a State Implementation Plan, is presented at the link below. EPA approved the Klamath Falls plan in December 2003 and redesignated the Klamath Falls nonattainment area to attainment for the PM10 standards.



  • D6-1, Technical Analysis Protocol
  • D6-2, Klamath Falls Urban Growth Boundary Monitoring Network Sites (Map)
  • D6-3, PM10 Saturation Survey
  • D6-4, Emission Inventory and forecast
  • D6-5, Conformity Process
  • D6-6, Historical and Projected Population, Households, Employment and Weather (2.21 MB)
  • D6-7, Klamath County Ordinance and Other Agreements (6.05 MB)
  • D6-8, Design Value and 2015 Projections
  • EPA Federal Register. "Approval and Promulgation of Air Quality Implementation Plans; State of Oregon; Klamath Falls PM-10 Nonattainment Area Redesignation to Attainment and Designation of Areas for Air Quality Planning Purposes", October 2003

For more information contact Larry Calkins in Hermiston at 541-567-8297 x25 or by email

[print version]


For more information about DEQ's Eastern Region call 541-388-6146 (Bend) or 541-276-4063 (Pendleton) or email DEQ Info .

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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