On June 13, 2023, the Environmental Protection Agency (EPA) proposed a rule titled ``Air Plan Approval; Revision to Air Pollution Control Rules'' to approve revisions to the State Implementation Plan (SIP) for Oklahoma submitted by the State of Oklahoma on January 30, 2023. The EPA is extending the comment period on this proposed rule that currently closes on July 13, 2023, to allow additional time for stakeholders to review and comment on the proposal.