WASHINGTON, Dec. 31 -- The U.S. Environmental Protection Agency has issued a rule (40 CFR Part 52), published in the Federal Register on Dec. 28, 2023, entitled "Air Plan Approval; Oklahoma; Revisions to Air Pollution Control Rules." The rule was issued by Earthea Nance, Regional Administrator, Region 6. * * * SUMMARY: 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, s  more