The Environmental Protection Agency (EPA) is finalizing the approval of changes to the North Carolina State Implementation Plan (SIP), submitted by the State of North Carolina through the North Carolina Department of Environmental Quality (NCDEQ), Division of Air Quality (DAQ), through a letter dated April 13, 2021. This SIP revision includes changes to a subset of NCDEQ's regulations regarding emission control standards. EPA is approving these changes pursuant to the Clean Air Act (CAA or Act).