Approval and Promulgation of Air Quality Implementation Plans; Pennsylvania; Allegheny County Reasonably Available Control Technology Under the 8-Hour Ozone National Ambient Air Quality Standard

EPA is approving a State Implementation Plan (SIP) revision for the Commonwealth of Pennsylvania submitted by Allegheny County Health Department (ACHD). This SIP revision consists of a demonstration that Allegheny County's portion of the Pennsylvania requirements of reasonably available control technology (RACT) for nitrogen oxides (NO<INF>X</INF>) and volatile organic compounds (VOCs) satisfy the RACT requirements set forth by the Clean Air Act (CAA). This SIP revision demonstrates that all requirements for RACT are met through: Certification that previously adopted RACT controls in Pennsylvania's SIP that were approved by EPA under the 1-hour ozone national ambient air quality standards (NAAQS) are based on the currently available technically and economically feasible controls, and that they continue to represent RACT for the 8- hour ozone NAAQS; a negative declaration demonstrating that no facilities exist in Allegheny County for certain control technology guideline (CTG) categories; and a new RACT determination for a specific source. This action is being taken under the CAA.