The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the State of North Carolina through the North Carolina Division of Air Quality (NCDAQ) with a letter dated March 21, 2018. The SIP submittal includes changes to the State's air quality rules for ozone to be consistent with the National Ambient Air Quality Standards (NAAQS). EPA is approving these provisions of the SIP revision because the State has demonstrated that these changes are consistent with the Clean Air Act (CAA or Act) and federal regulations.