The Environmental Protection Agency (EPA) is taking final action to approve several revisions to the North Carolina State Implementation Plan (SIP) submitted by the State of North Carolina through the North Carolina Department of Environmental Quality (formerly the North Carolina Department of Environment and Natural Resources (NCDENR)), Division of Air Quality (DAQ), on October 14, 2004, March 24, 2006, and January 31, 2008. The revisions include changes to several regulations and the addition of a new section to the Exclusionary Rules of the North Carolina SIP. These revisions are part of North Carolina's strategy to meet and maintain the national ambient air quality standards (NAAQS). This action is being taken pursuant to the Clean Air Act (CAA or Act) and its implementing regulations.