The Environmental Protection Agency (EPA) is finalizing its redesignation of the Detroit, Michigan area to attainment for the 2015 ozone National Ambient Air Quality Standards (NAAQS) in accordance with a request from the Michigan Department of Environment, Great Lakes, and Energy (EGLE). EGLE submitted this request on January 3, 2022. EPA is approving, as a revision to the Michigan State Implementation Plan (SIP), the State's plan for maintaining the 2015 ozone NAAQS through 2035 in the Detroit area.

The Environmental Protection Agency (EPA) is approving revisions to Michigan Air Pollution Control Rules Part 1 Definitions, and Part 2 Air Use Approval for inclusion in the Michigan State Implementation Plan (SIP). Additionally, EPA is removing rules from the SIP that are part of Michigan's title V Renewable Operating Permit program, and rules that have been moved to other sections of the Michigan Administrative Code and approved into the Michigan SIP.

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 Texas as proposed on October 9, 2020, and supplemented on December 20, 2022. The revisions were submitted by Texas on May 13, 2020, to meet the Reasonable Further Progress (RFP) requirements for the Dallas-Fort Worth Serious ozone nonattainment area (DFW area) for the 2008 ozone National Ambient Air Quality Standard (NAAQS).

The Environmental Protection Agency (EPA) is extending the comment period for the proposed rule ``Determination of Attainment by the Attainment Date But For International Emissions for the 2015 Ozone National Ambient Air Quality Standard; El Paso-Las Cruces, Texas-New Mexico'' that was published on March 7, 2023. The proposal provided for a public comment period ending April 6, 2023. The EPA received a request from the public to extend this comment period. The EPA is extending the comment period to May 8, 2023.