Air Quality State Implementation Plans; Approvals and Promulgations: Missouri; Clean Data Determination for the 2015 8-Hour Ozone Standard for the Missouri Portion of the St. Louis Nonattainment Area
EPA proposes a clean data determination for the Missouri portion of the St. Louis nonattainment area under the 2015 8-hour ozone standard, which would remove certain Clean Air Act requirements for that area.
Aforeworn detected this change in the Environmental & Emissions Compliance (EPA) space on August 12, 2026 and published this briefing so affected operators are forewarned rather than caught off guard. It is rated Low urgency. Manufacturers, power generators, chemical processors, and other sources in the Missouri portion of the St. Louis nonattainment area subject to the 2015 ozone standard. should confirm how it applies to their specific situation before acting. There is a time constraint attached: Not specified in the excerpt; comment period and final action dates are not provided.. Acting after that point can mean penalties, a lapsed licence, or lost eligibility — exactly the kind of surprise Aforeworn exists to prevent. Aforeworn monitors Environmental & Emissions Compliance (EPA) continuously and turns every detected change into a plain-English briefing like this one, so you always know first. Forewarned is forearmed.
What changed
The EPA is proposing to determine that the Missouri portion of the St. Louis area has attained the 2015 8-hour ozone standard, which would suspend certain Clean Air Act requirements (e.g., new source review and conformity) for that area.
Who it affects
Manufacturers, power generators, chemical processors, and other sources in the Missouri portion of the St. Louis nonattainment area subject to the 2015 ozone standard.
What you must do
Monitor the rulemaking and prepare to adjust compliance obligations if the determination is finalized.
Deadline
Not specified in the excerpt; comment period and final action dates are not provided.
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