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Summary of Spokane Carbon Monoxide (CO) Attainment Plan


 The Spokane, Washington, urbanized area was designated nonattainment for Carbon Monoxide (CO) and classified as moderate upon enactment of the Clean Air Act Amendments in 1990.

Washington submitted a CO attainment plan on January 22, 1993, and various revisions, dated September 14, 1993 and April 30, 1996.

EPA approved the plans on September 22, 1997 (62 FR 49442 (PDF)(3 pp, 119 K, About PDF)), with a correction on December 31, 1997 (62 FR 68187 (PDF)(2 pp, 116 K)). 


The plan relies on control strategies needed to assure attainment of the National Ambient Air Quality Standard (NAAQS) for carbon monoxide. The strategy focuses on tracking vehicle miles traveled (VMT); vehicle emission inspection and maintenance program; oxygenated fuel; transportation conformity; and, Reasonably Available Control Measures for residential wood combustion, point sources, and new source review.


  • 40 CFR Part 86, Federal Motor Vehicle Emission Control Program 
  • SCAPCA Section 6.16, Motor Fuel Specifications for Oxygenated Gasoline
  • WAC 173-492, Motor Fuel Specifications for Oxygenated Gasoline
  • SCAPCA Article VIII, Solid Fuel Burning Device Standards
  • WAC 173-433, Solid Fuel Burning Device Standards

City of Spokane Ordinance

  • Ordinance No. C 25628, Reduction of On-Street Parking, August 27, 1980

Contingency Measures

  • SCAPCA Section 6.16.H, Motor Fuel Specifications for Oxygenated Gasoline
  • SCAPCA Section 8.07 & Section 8.09, Ban on Uncertified Stoves
  • RCW 70.94.521-551 (dated November 13, 1992), Transportation Demand Management Program

EPA Effective Date

October 22, 1997, and December 31, 1997.