Approval and Promulgation of Implementation Plans; State of Colorado; Regional Haze State Implementation Plan

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EPA is approving a State Implementation Plan (SIP) revision submitted by the State of Colorado on May 25, 2011 that addresses regional haze. Colorado submitted this SIP revision to meet the requirements of the Clean Air Act (CAA or "the Act") and our rules that require states to prevent any future and remedy any existing man- made impairment of visibility in mandatory Class I areas caused by emissions of air pollutants from numerous sources located over a wide geographic area (also referred to as the "regional haze program"). EPA is taking this action pursuant to section 110 of the CAA.