EPA Labels Tribal Connecticut Areas 'Serious' for Ozone Woes
Published Date: 4/23/2026
Rule
Summary
The EPA found that the Mashantucket Pequot and Mohegan tribal lands in Greater Connecticut didn’t meet the 2015 ozone air quality standards on time. Because of this, these areas are now officially labeled as 'Serious' for ozone pollution, meaning stricter rules will kick in to clean the air. This change starts May 26, 2026, and could mean new efforts (and costs) to improve air quality for the tribes and nearby communities.
Analyzed Economic Effects
3 provisions identified: 1 benefits, 1 costs, 1 mixed.
NNSR thresholds change in new Serious areas
For areas that are newly reclassified to Serious nonattainment, the New Source Review (NNSR) major-source threshold and offset requirements will change for stationary sources seeking preconstruction permits, including on tribal lands. If you operate a stationary source (for example, a factory or large facility) in a newly classified Serious area, those permitting rules would apply.
Tribal lands reclassified to Serious
If you live on or near the Mashantucket Pequot Tribal Nation or the Mohegan Indian Tribe lands in Connecticut, those tribal portions of the Greater Connecticut area were officially reclassified to "Serious" nonattainment for the 2015 ozone standard effective May 26, 2026. EPA found these areas did not attain the 2015 ozone National Ambient Air Quality Standard by the August 3, 2024 attainment date.
No significant small-entity economic impact
EPA certified that this final rule will not have a significant economic impact on a substantial number of small entities under the Regulatory Flexibility Act and determined it does not impose an unfunded mandate under the Unfunded Mandates Reform Act. The rule is effective May 26, 2026; petitions for judicial review must be filed by June 22, 2026.
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