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EPA/OAR RIN: 2060-AV63 Publication ID: Spring 2023 
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)" 
Abstract:

The EPA is taking this action to revise the current ozone absorption cross-section stated in appendix D to the recently revised international consensus-based cross-section value of 1.1329x10−17 cm2 molecule−1 or 304.39 atm-1 cm-1 with an uncertainty of 0.94 atm-1 cm-1, which is 1.2% lower than the current value of 308 atm-1 cm-1. 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 changing the current absorption cross-section to the revised consensus-based value because it reflects an advancement in science and measurement technology that will improve the bias and reduce the uncertainty in this value.

 
Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 50   
Legal Authority: 42 U.S.C. 7401 to 7671q.   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  02/24/2023  88 FR 11835   
Final Rule  07/00/2023 
Additional Information: EPA-HQ-OAR-2022-0007.
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
C304-06,
Research Triangle Park, NC 27711
Phone:919 541-3372
Fax:919 541-1903
Email: Rice.Joann@epamail.epa.gov