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EPA/OAR RIN: 2060-AV63 Publication ID: Spring 2022 
Title: ●Revision to 40 CFR Part 50, Appendix D, "Reference Measurement Principle and Calibration Procedure for the Measurement of Ozone in the Atmosphere (Chemiluminescence Method)" 

The current absorption cross-section value is 60 years old. The cross-section value serves as the basis for calculating and calibrating ozone concentrations using the ultraviolet (UV) photometric method of analysis. The EPA is proposing a change to the absorption cross section, which reflects an advancement in science and measurement technology, to improve the bias and reduce the uncertainty in this value.

Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 50   
Legal Authority: 42 U.S.C. 7401 et seq.   
Legal Deadline:  None
Action Date FR Cite
NPRM  08/00/2022 
Final Rule  04/00/2023 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Joann Rice
Environmental Protection Agency
Office of Air and Radiation
Research Triangle Park, NC 27711
Phone:919 541-3372
Fax:919 541-1903