Approval and Promulgation of Implementation Plans; Mississippi; 110(a)(1) and (2) Infrastructure Requirements for the 1997 and 2006 Fine Particulate Matter National Ambient Air Quality Standards

EPA is taking final action to approve the State Implementation Plan (SIP) submissions, submitted by the State of Mississippi, through the Mississippi Department of Environmental Quality (MDEQ), as demonstrating that the State meets portions of the SIP requirements of sections 110(a)(1) and (2) of the Clean Air Act (CAA or Act) for the 1997 annual and 2006 24-hour fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standards (NAAQS). Section 110(a) of the CAA requires that each state adopt and submit a SIP for the implementation, maintenance, and enforcement of each NAAQS promulgated by the EPA, which is commonly referred to as an "infrastructure" SIP. MDEQ certified that the Mississippi SIP contains provisions that ensure the 1997 annual and 2006 24-hour PM<INF>2</INF> NAAQS are implemented, enforced, and maintained in Mississippi (hereafter referred to as "infrastructure submissions"). With the exception of sections 110(a)(2)(D)(i), 110(a)(2)(E)(ii) and 110(a)(2)(G), each of which will be addressed in separate actions, Mississippi's infrastructure submissions, provided to EPA on December 7, 2007, and October 6, 2009, address all the required infrastructure elements for the 1997 annual and 2006 24-hour PM<INF>2</INF> NAAQS.