The Environmental Protection Agency (EPA) is taking final action to approve, in part, and disapprove in part, the State Implementation Plan (SIP) submission, submitted by the State of Mississippi, through the Mississippi Department of Environmental Quality (MDEQ), on December 11, 2015, to demonstrate that the State meets the infrastructure requirements of the Clean Air Act (CAA or Act) for the 2012 annual fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standard (NAAQS). The CAA requires that each state adopt and submit a SIP for the implementation, maintenance and enforcement of each NAAQS promulgated by EPA, which is commonly referred to as an "infrastructure SIP submission." MDEQ certified that the Mississippi SIP contains provisions that ensure the 2012 Annual PM<INF>2.5</INF> NAAQS is implemented, enforced, and maintained in Mississippi. With the exception of the PSD permitting requirements and the interstate transport provisions, for which EPA is not acting upon, and the state board majority requirements respecting significant portion of income, for which EPA is finalizing disapproval, EPA is finalizing that portions of Mississippi's infrastructure submission, submitted to EPA on December 11, 2015, as satisfying certain required infrastructure elements for the 2012 Annual PM<INF>2.5</INF> NAAQS.