Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; North Carolina: Redesignation of the Greensboro-Winston-Salem-High Point 1997 Annual Fine Particulate Matter Nonattainment Area to Attainment

Samenvatting

EPA is proposing to approve SIP revisions submitted on December 18, 2009, and December 22, 2010 (supplemental submission) by the State of North Carolina, through the North Carolina Department of Environment and Natural Resources (NC DENR), Division of Air Quality (DAQ), to support North Carolina's request to redesignate the Greensboro-Winston-Salem-High Point fine particulate matter (PM 2.5 ) nonattainment area (hereafter the "Greensboro Area" or "Area") to attainment for the 1997 Annual PM 2.5 National Ambient Air Quality Standards (NAAQS). The Greensboro Area is comprised of Davidson and Guilford Counties in their entireties. EPA is now proposing four separate but related actions. First, EPA is proposing to approve the December 18, 2009, PM 2.5 redesignation request, including the December 22, 2010, Motor Vehicle Emission Simulator (MOVES) mobile model supplement for the Greensboro Area, provided that EPA takes final action to approve specific provisions of the North Carolina Clean Smokestacks Act (NCCSA). Second, EPA is proposing to approve North Carolina's 2008 emissions inventory for the Greensboro Area under section 172(c)(3) of the Clean Air Act (CAA or Act). Third, subject