EPA is taking final action to approve changes to the North Carolina State Implementation Plan (SIP), submitted by the State of North Carolina Department of Environment and Natural Resources (NC DENR), on August 2, 2012. Specifically, the State submitted limited maintenance plan updates for carbon monoxide (CO), showing continued attainment of the 8-hour CO national ambient air quality standard for the Charlotte, Raleigh/Durham and Winston-Salem Areas. EPA is approving this SIP revision because the State has demonstrated that the revision is consistent with the Clean Air Act (CAA or Act).