Approval and Promulgation of Implementation Plans; Region 4 States; Section 110(a)(2)(D)(i)(II) Infrastructure Requirement for the 1997 and 2006 Fine Particulate Matter National Ambient Air Quality Standards

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EPA is proposing to approve submissions from Alabama, Georgia, Mississippi and South Carolina for inclusion into each states' State Implementation Plans (SIP). This proposal pertains to the Clean Air Act (CAA) requirements regarding prevention of significant deterioration (PSD) for the 1997 annual and 2006 24-hour fine particulate matter (PM 2.5 ) National Ambient Air Quality Standards (NAAQS) infrastructure SIPs. 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. EPA is proposing to approve the submissions for Alabama, Georgia, Mississippi, and South Carolina that relate to adequate provisions prohibiting emissions that interfere with any other state's required measures to prevent significant deterioration of its air quality. All other applicable infrastructure requirements for the 1997 annual and 2006 24-hour PM 2.5 NAAQS associated with these States are being addressed in separate rulemakings.