Air Plan Approval; Missouri; Construction Permit Exemptions
Key claim: EPA has given final approval to Missouri’s updated air rules that refine which construction projects—especially emergency generators—can skip a construction permit and how those exemptions must be documented.
Abstract
(Rule · Environmental Protection Agency) The U.S. Environmental Protection Agency (EPA) is approving revisions to the Missouri State Implementation Plan (SIP) received on February 10, 2026. The submission revises Missouri’s regulation on construction permit exemptions in its Minor New Source Review (NSR) program. These revisions refine exemptions for emergency generators, update references to other rules, and update recordkeeping requirements. The EPA’s final approval of this rule revision is being done in accordance with the requirements of the Clean Air Act (CAA).
Why this matters
Minor NSR construction-permit exemptions determine which small or routine air emission sources—like backup generators at hospitals, data centers, and factories—can be built without pre-construction permitting review. Missouri’s updated rule, now federally enforceable through SIP approval, narrows and better documents those exemptions, which affects compliance costs and recordkeeping burdens for in-state sources without changing underlying emission limits. The approval is a routine, state-specific implementation step rather than a national policy shift.