# Revisions to the California State Implementation Plan, South Coast Air Quality Management District
> **Rule** · Final rule. · Published 2009-04-27 · Effective 2009-05-27 · 74 FR 18995
## Document
- **Document number:** E9-9436
- **Category:** air-emissions
- **Federal Register citation:** 74 FR 18995
- **CFR reference:** 40 CFR 52
- **Publication date:** 2009-04-27
- **Effective date:** 2009-05-27
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2008-0502
## Abstract

EPA is finalizing approval of revisions to the South Coast Air Quality Management District (SCAQMD) portion of the California State Implementation Plan (SIP). These revisions were proposed in the Federal Register on July 30, 2008 and concern oxides of nitrogen (NOx) emissions from gaseous- and liquid-fueled internal combustion engines. We are approving a local rule that regulates these emission sources under the Clean Air Act as amended in 1990 (CAA or the Act).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/04/27/E9-9436/revisions-to-the-california-state-implementation-plan-south-coast-air-quality-management-district)
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