Approval and Promulgation of Implementation Plans; Idaho

EPA is approving a State Implementation Plan (SIP) revision submitted by the State for Idaho for the purpose of addressing the "good neighbor" provisions of the Clean Air Act (the Act or CAA) section 110(a)(2)(D)(i) for the 1997 8-hour ozone National Ambient Air Quality Standards (NAAQS or standards) and the 1997 PM<INF>2.5</INF> NAAQS. This SIP revision addresses the requirement that the State of Idaho's SIP have adequate provisions to prohibit air emissions from adversely affecting another state's air quality through interstate transport. In this action, EPA is approving the Idaho Interstate Transport SIP provisions that address the requirement of section 110(a)(2)(D)(i) that emissions from Idaho sources do not significantly contribute to nonattainment of the 1997 8-hour ozone NAAQS and the 1997 PM<INF>2.5</INF> NAAQS in any other state, interfere with maintenance of the 1997 8-hour ozone NAAQS and the 1997 PM<INF>2.5</INF> NAAQS in any other state, and interfere with measures required in the SIP of any other state under part C of subchapter I of the CAA to prevent significant deterioration of air quality. This action is being taken under section 110 and part C of subchapter I of the CAA.