Data / Federal rules / 2026-07889

Finding of Failure To Attain and Reclassification of Tribal Portions of the Greater Connecticut Ozone Nonattainment Area as Serious for the 2015 Ozone National Ambient Air Quality Standards

The Environmental Protection Agency published this final rule in the Federal Register on April 23, 2026. It took effect on May 26, 2026.

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What the agency says

The Environmental Protection Agency (EPA) is finalizing its finding that the tribal portions of the Greater Connecticut area (the Mashantucket Pequot Tribal Nation and the Mohegan Indian Tribe) did not attain the 2015 ozone National Ambient Air Quality Standards (NAAQS) by the attainment date and a reclassification of those portions of the area to Serious nonattainment for the 2015 ozone NAAQS. Additionally, the EPA is taking final action on an exceptional events request submitted by CT DEEP on July 1, 2024, and the EPA's July 22, 2024 concurrence and nonconcurrence with CT DEEP's request. This final action fulfills the EPA's statutory obligation to determine whether the Mashantucket Pequot Tribal Nation and the Mohegan Indian Tribe's portions of the Greater Connecticut area attained the NAAQS by the attainment date. This action is being taken in accordance with the Clean Air Act.

Key facts

Document number: 2026-07889
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: April 23, 2026
Takes effect: May 26, 2026
Dates: This rule is effective on May 26, 2026.
Docket: EPA-R01-OAR-2024-0325; FRL-13014-02-R1
Code of Federal Regulations: 40 CFR 81
Topics: Air pollution control; Carbon monoxide; Environmental protection; Intergovernmental relations; Lead; Nitrogen dioxide; Ozone; Particulate matter; Reporting and recordkeeping requirements; Sulfur oxides; Volatile organic compounds
Pages: 3

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on air pollution control · Rules on carbon monoxide · Rules on environmental protection · Published in April 2026

Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.