Approval and Promulgation of Implementation Plans; Mississippi: New Source Review-Prevention of Significant Deterioration; Fine Particulate Matter (PM2.5

EPA is proposing to approve a revision to the Mississippi State Implementation Plan (SIP), submitted by the Mississippi Department of Environmental Quality (MDEQ) through the Division of Air Pollution Control to EPA on May 12, 2011. The SIP revision modifies Mississippi's New Source Review (NSR) Prevention of Significant Deterioration (PSD) program. The May 12, 2011, SIP revision incorporates by reference the federal NSR PSD requirements for the fine particulate matter (PM2.5) national ambient air quality standards (NAAQS) as amended in EPA's 2008 NSR PM2.5 Implementation Rule (hereafter referred to as the ``NSR PM2.5 Rule'') and the 2010 PM2.5 PSD Increment, Significant Impact Levels (SILs) and Significant Monitoring Concentration (SMC) Rule (hereafter referred to the ``PM2.5 PSD Increment-SILs-SMC Rule'') into the Mississippi SIP. EPA is proposing to approve portions of Mississippi's SIP revision because the Agency has preliminarily determined that the provisions proposed for approval are consistent with section 110 of the Clean Air Act (CAA or Act) and EPA regulations regarding NSR permitting.

Agency Contact: For information regarding the Mississippi SIP, contact Ms. Twunjala Bradley, Regulatory Development Section, Air Planning Branch, Air, Pesticides and Toxics Management Division, U.S. Environmental Protection Agency, Region 4, 61 Forsyth Street SW., Atlanta, Georgia 30303-8960. Ms. Bradley's telephone number