# Revisions to the California State Implementation Plan, Imperial County and Monterey Bay Unified Air Pollution Control Districts
> **Rule** · Direct final rule. · Published 2007-11-15 · Effective 2008-01-14 · 72 FR 64156
## Document
- **Document number:** E7-21811
- **Category:** air-emissions
- **Federal Register citation:** 72 FR 64156
- **CFR reference:** 40 CFR 52
- **Publication date:** 2007-11-15
- **Effective date:** 2008-01-14
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2007-1003
## Abstract

EPA is taking direct final action to approve revisions to the Imperial County Air Pollution Control District (ICAPCD) and the Monterey Bay Unified Air Pollution Control District (MBUAPCD) portions of the California State Implementation Plan (SIP). This action revises and adds various definitions of terms used by the ICAPCD and MBUAPCD. Under authority of the Clean Air Act as amended in 1990 (CAA or the Act), we are approving local rules that are administrative and address changes for clarity and consistency.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/11/15/E7-21811/revisions-to-the-california-state-implementation-plan-imperial-county-and-monterey-bay-unified-air)
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