# Air Quality: Revision to Definition of Volatile Organic Compounds-Exclusion of trans-1,3,3,3-tetrafluoropropene
> **Rule** · Final rule. · Published 2012-06-22 · Effective 2012-07-23 · 77 FR 37610
## Document
- **Document number:** 2012-15347
- **Category:** air-emissions
- **Federal Register citation:** 77 FR 37610
- **CFR reference:** 40 CFR 51
- **Publication date:** 2012-06-22
- **Effective date:** 2012-07-23
- **EPA docket:** EPA-HQ-OAR-2010-0605
## Abstract

This action revises the EPA's definition of volatile organic compounds (VOCs) under the Clean Air Act (CAA). This revision adds trans-1,3,3,3-tetrafluoropropene (also known as HFO-1234ze) 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. As a result, if you are subject to certain federal regulations limiting emissions of VOCs, your emissions of HFO-1234ze may not be regulated for some purposes. This action may also affect whether HFO-1234ze is considered a VOC for state regulatory purposes, depending on whether the state relies on the EPA's definition of VOC.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/06/22/2012-15347/air-quality-revision-to-definition-of-volatile-organic-compounds-exclusion-of)
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