Approval and Promulgation of Definition of Areas for Air Quality Planning Purposes; Oregon-Washington

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The Environmental Protection Agency (EPA) approves the separation of the Portland, Oregon-Vancouver, Washington interstate carbon monoxide (CO) nonattainment area into two distinct nonattainment areas. The Oregon Department of Environmental Quality (ODEQ) has submitted sufficient technical documentation to adequately assure EPA that Vancouver and Portland are two separate CO airsheds. EPA believes any future problems will be hotspot in nature and therefore, EPA believes the CO national ambient air quality standards (NAAQS) will be protected in each state. This boundary correction will change the boundary description published in the November 6, 1991 Federal Register document.