# Air Quality: Revision to Definition of Volatile Organic Compounds-Exclusion of Propylene Carbonate and Dimethyl Carbonate
> **Rule** · Final rule. · Published 2009-01-21 · Effective 2009-02-20 · 74 FR 3437
## Document
- **Document number:** E9-1150
- **Category:** air-emissions
- **Federal Register citation:** 74 FR 3437
- **CFR reference:** 40 CFR 51
- **Publication date:** 2009-01-21
- **Effective date:** 2009-02-20
- **EPA docket:** EPA-HQ-OAR-2006-0948
## Abstract

This action revises EPA's definition of volatile organic compounds (VOCs) for purposes of preparing state implementation plans (SIPs) to attain the national ambient air quality standard for ozone under Title I of the Clean Air Act (Act). This revision adds the compounds propylene carbonate and dimethyl carbonate to the list of compounds which are excluded from the definition of VOC on the basis that these compounds make a negligible contribution to tropospheric ozone formation.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/01/21/E9-1150/air-quality-revision-to-definition-of-volatile-organic-compounds-exclusion-of-propylene-carbonate)
---
*AI Analytics · CC0 1.0*