Approval of Implementation Plans and Designation of Areas; Alabama; Redesignation of the Alabama Portion of the Chattanooga, 1997 p.m.2.5 Nonattainment Area to Attainment

الملخص

On April 23, 2013, the Alabama Department of Environmental Management (ADEM), submitted a request to redesignate the Alabama portion of the Chattanooga, TN-GA-AL fine particulate matter (PM 2.5 ) nonattainment area (hereafter referred to as the "Chattanooga TN-GA-AL Area" or "Area") to attainment for the 1997 Annual PM 2.5 National Ambient Air Quality Standards (NAAQS) and to approve a State Implementation Plan (SIP) revision containing a maintenance plan for the Alabama portion of the Chattanooga TN-GA-AL Area. The Alabama portion of the Chattanooga TN-GA-AL Area is comprised of a portion of Jackson County in Alabama. EPA is approving the redesignation request and the related SIP revision, including the plan for maintaining attainment of the 1997 Annual PM 2.5 standard for the Chattanooga TN-GA-AL Area. EPA is also approving the on-road motor vehicle insignificance determination for direct PM 2.5 and nitrogen oxides (NOx) for the Alabama portion of the Chattanooga TN-GA-AL Area. On September 14, 2012, and November 13, 2014, Georgia and Tennessee (respectively) submitted requests to redesignate the Georgia and Tennessee portions of the Chattanooga TN-GA-AL Area. EPA will be taking