Pursuant to the Federal Clean Air Act (CAA or the Act), the Environmental Protection Agency (EPA) is approving revisions to the State Implementation Plan (SIP) for Oklahoma submitted by the State of Oklahoma designee with a letter dated May 7, 2020. The submittal covers updates to the Oklahoma SIP, as contained in the State's 2019 annual SIP update. Specifically, this action addresses revisions to Oklahoma Administrative Code (OAC) Title 252 Chapter 100 Subchapter 39, Emission of Volatile Organic Compounds (VOCs) in Nonattainment Areas and Former Nonattainment Areas. There are two Oklahoma counties affected by this action: Tulsa County and Oklahoma County.