Approval and Promulgation of Air Quality Implementation Plans; Wyoming; Revisions to Regional Haze State Implementation Plan; Revisions to Regional Haze Federal Implementation Plan

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The Environmental Protection Agency (EPA) is proposing to approve a State Implementation Plan (SIP) revision submitted by the State of Wyoming on April 5, 2018, addressing regional haze. The revisions modify the sulfur dioxide (SO 2 ) emissions reporting requirements for Laramie River Station Units 1 and 2. We are also proposing to revise the nitrogen oxides (NO X ) best available retrofit technology (BART) emission limits for Laramie River Units 1-3 in the Federal Implementation Plan (FIP) for regional haze in Wyoming. The proposed revisions to the Wyoming regional haze FIP would also establish a SO 2 emission limit averaged annually across both Laramie River Station Units 1 and 2. The EPA is proposing this action pursuant to section 110 of the Clean Air Act (CAA).