Air Quality

Because of topography, weather and a large number of woodstoves, the Klamath Falls area has a long history of identifying problems with particulate pollutions and working to solve them. With increased understanding of the health effects of particulates, EPA has made the standards more protective over time, addressing smaller sized particles that are the most hazardous but more difficult to control. Since 1994, the Klamath Falls area has attained the larger or coarse (PM10) particulate matter standard. In 2009, with the adoption of a fine particulate (PM2.5) matter standard, EPA changed the legal status of the Klamath Falls Area from attainment (meeting air quality standards) to nonattainment (not meeting air quality standards) for fine particulate matter (PM2.5). DEQ has adopted an attainment plan with associated regulations to ensure that the Klamath Falls area meets the current PM2.5 standard.

2012 Klamath Falls Fine Particulate Matter Attainment Plan

Adopted Dec. 6, 2012

Klamath Falls Fine Particulate Matter Attainment Plan

Append. 1-26 combined:
  • Appendix 1.  Klamath Falls PM10 and PM2.5  Saturation Survey Report – 1996-1997
  • Appendix 2.  Klamath Falls PM2.5 Particulate Site Validation Study - 2000-2001
  • Appendix 3-1.  Klamath Falls 2010-2011 PM2.5 Survey
  • Appendix 3-2.  Klamath Falls 2010-11 PM2.5 Survey - Appendix A - Site Photos
  •  Appendix 4. Klamath Falls PM2.5 Levels Compared to Background Concentrations
  • Appendix 5. SANDWICH Analysis and Speciation
  • Appendix 6-1. Secondary Organic Aerosols
  • Appendix 6-2. Discussions on the Potential Contribution of Secondary Organic Aerosol (including organonitrates) to PM2.5 in Klamath Falls
  • Appendix 7.  Report on PM2.5 Receptor Modeling in Klamath Falls
  • Appendix 8.  Economic Trends in Klamath Falls
  • Appendix 9. How Klamath Falls’ Topography and Winter Meteorology Elevate PM2.5 and Consideration of 2008 as a Base Year
  • Appendix 10-1.  Klamath Falls 2008 Oregon Woodheating Survey
  • Appendix 10-2.  Klamath Falls 2008 Oregon Woodheating Survey (Appendix A-1)
  • Appendix 10-3.  Klamath Falls 2008 Oregon Woodheating Survey (Appendix A-2)
  • Appendix 10-4.  Klamath Falls 2008 Oregon Woodheating Survey (Appendix B)
  • Appendix 11.  Klamath Falls Emission inventory and Forecast
  • Appendix 12.  Potential Contribution of Prescribed Burning on Klamath Falls Design Value Days
  • Appendix 13.  Effective Emissions
  • Appendix 14.  Woodstove Reductions and the Klamath County Ordinance
  • Appendix 15-1.  RACT-RACM
  • Appendix 15-2.  RACM Analysis
  • Appendix 15-3.   List of Rejected RACT-RACM Measures by the Advisory Committee
  • Appendix 16.  Klamath Air Quality Advisory Committee (KAQAC) Report
  • Appendix 17-1.  Klamath County Ordinance 2007
  • Appendix 17-2.  Klamath County Ordinance 2012
  • Appendix 18.  Klamath County Intergovernmental Agreement (IGA) 2013
  • Appendix 19-1.  Oregon Administrative Rule - Division 204
  • Appendix 19-2.  Oregon Administrative Rule - Division 225
  • Appendix 19-3.  Oregon Administrative Rule - Division 240
  • Appendix 19-4.  Oregon Administrative Rule - Division 262
  • Appendix 19-5.  Oregon Administrative Rule - Division 264
  • Appendix 20.  Klamath Falls Interagency Agreement to Reduce PM2.5 Emissions from Winter Sanding
  • Appendix 21.  Design Value
  • Appendix 22.  AERMOD Dispersion Modeling
  • Appendix 23-1.  Rollback Modeling
  • Appendix 23-2.  Rollback and Emission Reduction Measures
  • Appendix 24.  Unmonitored Area Analysis
  • Appendix 25.  Conformity – Determination of Insignificance for Klamath Falls
  • Appendix 26.  References

For more information on the 2012 Klamath Falls Fine Particulate Matter Attainment Plan, contact Rachel Sakata, Air Quality Planner, 503-229-5659

Historical timeline

1991: The EQC adopts a PM10 attainment plan which includes emission reduction strategies for: Woodstove and open burning curtailment, winter road sanding controls, public education programs, and agreements with Forestry and Agriculture agencies. The Klamath Falls Urban Growth Boundary is in nonattainment for PM10.

1994: Klamath Falls is in compliance with the standards.

1999: DEQ establishes a PM2.5 monitor in Klamath Falls and monitors high levels of PM2.5 in the airshed.

2002 DEQ prepares and the EQC adopts a PM10 Maintenance Plan for Klamath Falls:
Klamath Falls UGB PM10 Maintenance Plan

Append. 6-1 to 6-8 combined

  • Appendix 6-1 Technical Analysis Protocol
  • Appendix 6-2 Klamath Falls UGB Monitoring Network
  • Appendix 6-3 PM10 Saturation Survey
  • Appendix 6-4 Emission Inventory and Forecast
  • Appendix 6-5 Conformity
  • Appendix 6-6 Population and Historical Growth Trends
  • Appendix 6-7 Klamath County Ordinance and other agreements
  • Appendix 6-8 Design Value and 2015 Projections

2003: EPA approves the Maintenance Plan and associated rules for the Klamath Falls Maintenance area for coarse particulate matter (PM10). The legal status of the Klamath Falls area changes from nonattainment to attainment for PM10. The Urban Growth Boundary is now in attainment for coarse particulate matter (PM10).

2006: EPA revises PM2.5 standard.

2007: Klamath County revises its Clean Air Ordinance which further limits the use of woodburning devices inside the home and outdoor burning during the winter months when high levels of PM2.5 are evident. Woodstove replacement programs are implemented to help low income individuals replace their uncertified woodstoves with cleaner units.

2009: Klamath Falls along with Oakridge are designated Nonattainment for fine particulate matter (PM2.5) by EPA. PM2.5 concentrations are high enough to cause a violation of the 24 hour air quality standard also known as the National Ambient Air Quality Standard.

2011: DEQ conducted monitoring for Toxic Air Pollution and found that many toxic air pollution tracked with days of high wood stove pollution. See Fact Sheet describing Air Toxics in Klamath Falls.

2012: The EQC adopts the Klamath Falls PM2.5 Attainment Plan for Klamath Falls. The plan is submitted to the EPA.

Klamath Falls nonattainment area Boundary
Klamath Falls nonattainment area Boundary set by EPA 12/18/08. Klamath Falls Urban Growth Boundary and City Limit based on Oregon's Land Use Planning Laws