Approval and Promulgation of Implementation Plans; Washington; Interstate Transport of Pollution

EPA is approving the action of the Washington State Department of Ecology (Ecology) to address the provisions of Clean Air Act (CAA) section 110(a)(2)(D)(i) for the 8-hour ozone and PM2.5 National Ambient Air Quality Standards (NAAQS). CAA section 110(a)(2)(D)(i) requires each state to submit a State Implementation Plan (SIP) revision that prohibits emissions that adversely affect another state's air quality through interstate transport. EPA received no comments on its proposal to approve Ecology's SIP revision addressing these provisions. Therefore, EPA is finalizing its proposed approval of this revision for the State of Washington. Because EPA received adverse comments on its proposal to approve the SIP revision from the Idaho Department of Environmental Quality (IDEQ), EPA is not taking final action on the proposed approval for the State of Idaho at this time and will address those comments and take final action on IDEQ's submittal at a later date.