The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the State of North Carolina's Department of Environmental Quality (DEQ), Division of Air Quality (DAQ or Division), via a letter dated April 13, 2021. This rulemaking addresses the repeal of a State regulation related to delegation of authority and removal of the regulation from the North Carolina SIP. EPA is finalizing approval of these changes pursuant to the Clean Air Act (CAA or Act).