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EPA/OAR RIN: 2060-AW00 Publication ID: Spring 2023 
Title: ●Air Quality: Revision to the Regulatory Definition of Volatile Organic Compounds--Exclusion of (Z)-1-Chloro-2,3,3,3,-Tetrafluoropropene (HCFO-1224yd (Z) 

This action proposes to revise EPA's definition of Volatile Organic Compounds (VOC) for purposes of preparing State Implementation Plans (SIPs) to attain the National Ambient Air Quality Standards (NAAQS) for ozone. The action would add (Z)-1-Chloro2,3,3,3,-Tetrafluoropropene (also known as HCFO-1224yd (Z); CAS # 111512-60-8) to the list of compounds excluded from the definition of VOC on the basis that this compound makes a negligible contribution to tropospheric ozone formation. VOC exemption petition submitted by AGC Chemicals Americas, Inc., on July 29, 2020. This compound is not a hazardous air pollutant and is not a stratospheric ozone depleting substance. It has low global warming potential compared to other compounds which it is substituting.

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 63 subpart C   
Legal Authority: 42 U.S.C. 7401 et seq Clean Air Act   
Legal Deadline:  None
Action Date FR Cite
NPRM  12/00/2023 
Final Rule  07/00/2024 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: State 
Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Souad Benromdhane
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code C539-07,
Research Triangle Park, NC 27711
Phone:919 541-4359

Robert J. Wayland
Environmental Protection Agency
Office of Air and Radiation
Research Triangle Park, NC 27711
Phone:919 541-1045