Open for CommentEPA· Environmental Protection AgencyProposed Rule

Proposed Approval of the St. Louis, MO-IL 2015 Ozone Clean Data Determination

Introduced February 26, 2026Comment period ends March 31, 2026View on regulations.gov ↗
💬 Closes in 12 daysDeadline: Mar 31, 2026

What This Means

The EPA is confirming that the St. Louis area, which spans Missouri and Illinois, has met federal air quality standards for ozone pollution. This means the region no longer needs to follow strict pollution-reduction requirements that were previously in place. This matters to residents and businesses in the St. Louis area because it reduces regulatory burdens, though it also means there may be less active monitoring to ensure air quality stays clean going forward.

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Details

TypeFederal Regulation
AgencyEPA · Environmental Protection Agency
Regulations.gov IDEPA-R05-OAR-2026-0695-0001
IntroducedFebruary 26, 2026
Comment DeadlineMarch 31, 2026

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