# Revisions to the California State Implementation Plan, South Coast Air Quality Management District Sacramento Metropolitan Air Quality Management District
> **Rule** · Direct final rule. · Published 2009-05-06 · Effective 2009-07-06 · 74 FR 20880
## Document
- **Document number:** E9-10520
- **Category:** air-emissions
- **Federal Register citation:** 74 FR 20880
- **CFR reference:** 40 CFR 52
- **Publication date:** 2009-05-06
- **Effective date:** 2009-07-06
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2008-0839
## Abstract

EPA is taking direct final action to approve revisions to the South Coast Air Quality Management District (SCAQMD) and Sacramento Metropolitan Air Quality Management District (SMAQMD) portion of the California State Implementation Plan (SIP). These revisions concern oxides of nitrogen (NOx) emissions from boilers, process heaters, steam generators and residential water heaters. We are approving local rules that regulate 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/2009/05/06/E9-10520/revisions-to-the-california-state-implementation-plan-south-coast-air-quality-management-district)
---
*AI Analytics · CC0 1.0*