# Revisions to the California State Implementation Plan, Northern Sonoma County Air Pollution Control District (NSCAPCD) and Mendocino County Air Quality Management District (MCAQMD)
> **Rule** · Direct final rule. · Published 2011-05-06 · Effective 2011-07-05 · 76 FR 26192
## Document
- **Document number:** 2011-11038
- **Category:** air-emissions
- **Federal Register citation:** 76 FR 26192
- **CFR reference:** 40 CFR 52
- **Publication date:** 2011-05-06
- **Effective date:** 2011-07-05
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2011-0302
## Abstract

EPA is taking direct final action to approve revisions to the Northern Sonoma County Air Pollution Control District (NSCAPCD) and Mendocino County Air Quality Management District (MCAQMD) portions of the California State Implementation Plan (SIP). Both districts are required under Part C of title I of the Clean Air Act (CAA) to adopt and implement SIP-approved Prevention of Significant Deterioration (PSD) permit programs. These revisions update the definitions used in the districts' PSD permit programs.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2011/05/06/2011-11038/revisions-to-the-california-state-implementation-plan-northern-sonoma-county-air-pollution-control)
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