The Environmental Protection Agency (EPA) is finalizing the approval of a revision to the North Carolina State Implementation Plan (SIP) submitted by the North Carolina Department of Environmental Quality (NCDEQ), Division of Air Quality, via a letter dated April 13, 2021, and received by EPA on April 14, 2021. This revision contains minor clarifying and typographical edits to North Carolina's nitrogen oxides (NO<INF>X</INF>) rule. EPA is approving these changes pursuant to the Clean Air Act (CAA or Act).