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EPA/OAR RIN: 2060-AV24 Publication ID: Fall 2022 
Title: Air Quality: Revision to Definition of Volatile Organic Compounds--Exclusion of Hexafluoro-2-Butene (HFO-1336mzz-E) 

On April 28, 2022, EPA published a proposed action in response to a petition requesting the revision of EPA’s regulatory definition of volatile organic compounds (VOC) to exempt trans-1,1,1,4,4,4-hexafluorobut-2-ene (also known as HFO-1336mzz(E); CAS number 66711-86-2). The EPA plans to take final action to potentially revise the regulatory definition of VOC under the Clean Air Act (CAA). This action, if finalized, will add HFO-1336mzz(E) to the list of compounds excluded from the regulatory definition of VOC on the basis that this compound makes a negligible contribution to tropospheric ozone (O3) formation. VOC exemption petition submitted by Chemours on 11/30/2016.

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 63 subpart C   
Legal Authority: 42 U.S.C. 7401 et seq., Clean Air Act   
Legal Deadline:  None
Action Date FR Cite
NPRM  04/28/2022  87 FR 25170   
NPRM Comment Period End  06/27/2022 
Final Rule  02/00/2023 
Additional Information: .
Regulatory Flexibility Analysis Required: No  Government Levels Affected: State 
Small Entities Affected: No  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