Approval and Promulgation of Implementation Plans; Louisiana; Prevention of Significant Deterioration Significant Monitoring Concentration for Fine Particulates

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The Environmental Protection Agency (EPA) is approving two revisions to the Louisiana State Implementation Plan (SIP) that revise the Louisiana Prevention of Significant Deterioration (PSD) permitting program to establish the significant monitoring concentration (SMC) for fine particles (PM 2.5 ) at a zero microgram per cubic meter (0 [mu]g/m\3\) threshold level consistent with federal permitting requirements. The EPA is approving this action under section 110 and part C of the Clean Air Act (CAA or Act).