# Revisions to the California State Implementation Plan, Northern Sierra and Sacramento Metropolitan Air Quality Management District
> **Rule** · Direct final rule. · Published 2012-04-18 · Effective 2012-06-18 · 77 FR 23130
## Document
- **Document number:** 2012-9078
- **Category:** air-emissions
- **Federal Register citation:** 77 FR 23130
- **CFR reference:** 40 CFR 52
- **Publication date:** 2012-04-18
- **Effective date:** 2012-06-18
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2012-0243
## Abstract

EPA is taking direct final action to approve revisions to the Northern Sierra Air Quality Management District (NSAQMD) and Sacramento Metropolitan Air Quality Management District (SMAQMD) portions of the California State Implementation Plan (SIP). These revisions concern negative declarations for volatile organic compound (VOC) source categories for the NSAQMD and SMAQMD. We are approving these negative declarations under the Clean Air Act as amended in 1990 (CAA or the Act).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/04/18/2012-9078/revisions-to-the-california-state-implementation-plan-northern-sierra-and-sacramento-metropolitan)
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