Approval and Promulgation of Implementation Plans; Washington: Interstate Transport of Ozone

The Clean Air Act (CAA) requires each State Implementation Plan (SIP) to contain adequate provisions prohibiting emissions that will have certain adverse air quality effects in other states. On May 11, 2015, the State of Washington made a submittal to the Environmental Protection Agency (EPA) to address these requirements. The EPA is proposing to approve the submittal as meeting the requirement that each SIP contain adequate provisions to prohibit emissions that will contribute significantly to nonattainment or interfere with maintenance of the 2008 ozone National Ambient Air Quality Standard (NAAQS) in any other state.