Approval and Promulgation of Implementation Plans; Oklahoma; Disapproval of Prevention of Significant Deterioration for Particulate Matter Less Than 2.5 Micrometers-Significant Impact Levels and Significant Monitoring Concentration

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The Environmental Protection Agency (EPA) is disapproving the severable portions of the February 6, 2012, Oklahoma State Implementation Plan (SIP) submittal which establish certain de minimis thresholds for particulate matter less than 2.5 micrometers in diameter (PM 2.5 ) in the Prevention of Significant Deterioration (PSD) permitting requirements. Specifically, we are disapproving provisions that adopt and implement the PM 2.5 significant impact levels (SILs) and significant monitoring concentration (SMC); both of which were vacated by a federal court and subsequently removed from federal PSD regulations. We are disapproving the submitted provisions as inconsistent with federal laws and regulations for the permitting of PM 2.5 . The EPA is finalizing this disapproval under section 110 and part C of the Clean Air Act (CAA).