MO-478 Air Plan Approval; Missouri; Construction Permit Exemptions

The Environmental Protection Agency (EPA) is proposing to approve revisions to the Missouri State Implementation Plan (SIP) received on February 10, 2026. The submission revises Missouri’s regulation on construction permit exemptions. These revisions refine exemptions for emergency generators, update references to other rules, and update recordkeeping requirements. The EPA’s proposed approval of this rule revision is being done in accordance with the requirements of the Clean Air Act (CAA).