The Ohio Manufacturers’ Association (OMA) is pressing Ohio EPA on proposed changes to the state’s NOx emissions rules that would clarify key definitions, reshape which facilities are covered and reset compliance timelines under the Clean Air Act. A key revision to the definition of “potential to emit” could change whether certain manufacturers are subject to stricter requirements.

The proposal could shift regulatory obligations and compliance timing in ways that carry real operational and cost consequences. Ohio EPA says the changes are intended to address past inconsistencies, and OMA is pushing to make sure the final rules are clear, fair and workable for manufacturers.

“These are the kinds of technical rule changes that can carry major consequences for manufacturers,” said James Lee, managing director of public policy services for the OMA. “When definitions shift, compliance obligations can shift with them. The rules need to be clear, predictable and grounded in how facilities actually operate.”

OMA is staying engaged as the rulemaking moves forward to help ensure the final requirements are consistent, practical and realistic to implement. 3/26/2026