Approval and Promulgation of Implementation Plans; Idaho: Infrastructure Requirements for the 1997 8-Hour Ozone National Ambient Air Quality Standard; Prevention of Significant Deterioration Greenhouse Gas Permitting Authority and Tailoring Rule

EPA is approving the State Implementation Plan (SIP) submittals from the State of Idaho demonstrating that the Idaho SIP meets the requirements of section 110(a)(1) and (2) of the Clean Air Act (CAA) for the National Ambient Air Quality Standard (NAAQS) promulgated for ozone on July 18, 1997. EPA finds that the current Idaho SIP meets the following 110(a)(2) infrastructure elements for the 1997 8-hour ozone NAAQS: (A), (B), (C), (D)(ii), (E)(i), (E)(iii), (F), (G), (H), (J), (K), (L), and (M). EPA is taking no action on CAA section 110(a)(2)(E)(ii) at this time. We will address the requirements of this sub-element in a separate action. EPA is also approving a SIP revision that applies Idaho's Prevention of Significant Deterioration (PSD) Program to greenhouse gas (GHG) emitting sources above certain thresholds, updates Idaho's SIP to incorporate by reference revised versions of specific federal regulations, and removes unnecessary language from the SIP due to the incorporation by reference of the federal NAAQS and PSD regulations. In addition, EPA is rescinding the Federal Implementation Plan (FIP) put in place to ensure the availability of a permitting authority for greenhouse gas emitting sources in Idaho.