St. Louis Ozone Fails the Sniff Test: EPA Cracks Down
Published Date: 6/20/2025
Proposed Rule
Summary
The Missouri part of the St. Louis area didn’t meet clean air goals for ozone by the deadline, so it’s now officially labeled a “Serious” pollution zone starting December 31, 2024. This means tougher rules and more work to clean the air, affecting local businesses and residents. The EPA is now asking for public comments before finalizing these changes, with some decisions expected soon in 2025.
Analyzed Economic Effects
1 provisions identified: 0 benefits, 1 costs, 0 mixed.
St. Louis MO Reclassified to 'Serious'
The Missouri portion of the St. Louis area failed to meet the 2015 8-hour ozone air-quality standard and was reclassified to a 'Serious' nonattainment area effective December 31, 2024. That reclassification means tougher pollution-control rules and more work to reduce ozone pollution, which will affect local businesses and residents. The EPA is accepting public comments and took reconsideration steps in early 2025 (petition received January 24, 2025; Region 7 granted on March 5, 2025).
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