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

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The EPA proposes to approve 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. In the Final Rules Section of this Federal Register, the EPA is approving the State's SIP revision as a direct final rule without prior proposal because the Agency views this as a noncontroversial revision amendment and anticipates no adverse comments. A detailed rationale for the approval is set forth in the direct final rule. If no adverse comments are received in response to this proposed rule, no further activity is contemplated in relation to this rule. If the EPA receives adverse comments, the direct final rule will be withdrawn and all public comments received will be addressed in a subsequent final rule based on this proposed rule. The EPA will not institute a second comment period on this action.