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.

The Environmental Protection Agency (EPA) is approving a revision to the Idaho State Implementation Plan (SIP) submitted on May 4, 2022. The submission updates the incorporation by reference of the national ambient air quality standards and related planning and monitoring requirements into the Idaho air quality rules as of July 1, 2021. Idaho undertakes such updates regularly to ensure the state air quality rules and the federally enforceable Idaho SIP remain consistent with EPA air quality regulations over time.

The Environmental Protection Agency (EPA) is approving a revision to the Indiana particulate matter State Implementation Plan (SIP) that Indiana submitted to EPA on September 16, 2021, for the Vertellus Agriculture and Nutrition Specialties, LLC (Vertellus) facility located in Indianapolis, Marion County. Indiana requested revisions to incorporate site-specific updates to the particulate matter emission limits for Vertellus. The updates reflect revised emission rates for particulate matter resulting from process changes related to control strategies for other pollutants.

The Environmental Protection Agency (EPA) is taking final action to approve a revision to the Ventura County Air Pollution Control District (VCAPCD) portion of the California State Implementation Plan (SIP). This revision concerns emissions of volatile organic compounds (VOCs) from architectural coating operations. We are approving a local rule to regulate these emission sources under the Clean Air Act (CAA or the Act). Approval of the local rule as part of the California SIP makes it federally enforceable.