Data / Federal rules / 2026-05601

Determination of Attainment by the Attainment Date But for International Emissions for the 2015 Ozone National Ambient Air Quality Standards; Phoenix-Mesa Nonattainment Area, Arizona

The Environmental Protection Agency published this final rule in the Federal Register on March 23, 2026. It took effect on April 22, 2026.

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What the agency says

The Environmental Protection Agency (EPA or "Agency") is taking final action to determine that the Phoenix-Mesa nonattainment area ("Phoenix-Mesa area") would have attained the 2015 ozone national ambient air quality standards (NAAQS or "standards") by the August 3, 2024 "Moderate" area attainment date, but for emissions emanating from outside the United States. As a consequence of this action, the Phoenix-Mesa area is not subject to the Clean Air Act (CAA) requirements pertaining to reclassification upon failure to attain and remains classified as a Moderate nonattainment area for the 2015 ozone NAAQS. This final action fulfills the EPA's statutory obligation to determine whether the Phoenix-Mesa area attained the NAAQS by the attainment date. As a result of this final action, the State is no longer required to submit attainment and reasonable further progress (RFP) contingency measures for this area.

Key facts

Document number: 2026-05601
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: March 23, 2026
Takes effect: April 22, 2026
Dates: This rule is effective March 23, 2026.
Docket: EPA-R09-OAR-2025-2833; FRL-13057-02-R9
Code of Federal Regulations: 40 CFR 52
Topics: Administrative practice and procedure; Air pollution control; Environmental protection; Incorporation by reference; Intergovernmental relations; Nitrogen oxides; Ozone; Reporting and recordkeeping requirements; Volatile organic compounds
Pages: 5

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on administrative practice and procedure · Rules on air pollution control · Rules on environmental protection · Published in March 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.