Data / Federal rules / 2025-00946

Reference Measurement Principle and Calibration Procedure for the Measurement of Ozone in the Atmosphere (Chemiluminescence Method); Correction

The Environmental Protection Agency published this final rule in the Federal Register on January 16, 2025. It took effect on January 16, 2025.

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What the agency says

The Environmental Protection Agency (EPA) is correcting a final rule published in the Federal Register on October 12, 2023, that became effective on November 13, 2023. The final rule updated the current ozone absorption cross-section to the recommended consensus- based value of 1.1329x10-17 cm\2\ molecule-1 or 304.39 atm-1 cm-1. After publication, the EPA became aware of an error in the preamble text regarding the date for State, local, and Tribal monitoring agencies to complete implementation of the new ozone cross-section value, as well as a lack of clarity as to which entities the 2025 and 2026 implementation dates apply. With this action, the EPA is updating the final rule preamble and regulatory text to clarify the applicable implementation dates and the specific entities to which they apply. These corrections do not include any substantive changes to the final rule.

Key facts

Document number: 2025-00946
Type: Final rule
Action: Final rule; correction and correcting amendment
Agency: Environmental Protection Agency
Published: January 16, 2025
Takes effect: January 16, 2025
Dates: This final rule is effective on January 16, 2025.
Docket: EPA-HQ-OAR-2022-0007; FRL 9344.1-01-OAR
Regulation ID (RIN): 2060-AV63
Code of Federal Regulations: 40 CFR 50
Topics: Air pollution control; Environmental protection; Ozone
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 environmental protection · Rules on ozone · Published in January 2025

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.