View Rule

View EO 12866 Meetings Printer-Friendly Version     Download RIN Data in XML

EPA/OAR RIN: 2060-AV63 Publication ID: Fall 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 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 proposing to a change to 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: 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  12/00/2022 
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