The Environmental Protection Agency (EPA) is approving changes to the North Carolina State Implementation Plan (SIP) submitted through the North Carolina Division of Air Quality (NCDAQ) on October 9, 2020. The SIP revision seeks to modify the State's monitoring, recordkeeping, and reporting regulations by adding one definition, adding references to approved testing methods, updating the reference format, and making minor changes to general formatting and language use for clarity purposes. EPA is approving these changes pursuant to the Clean Air Act (CAA or Act).