# Revisions to the Arizona State Implementation Plan, Maricopa County
> **Rule** · Direct final rule. · Published 2007-08-06 · Effective 2007-10-05 · 72 FR 43537
## Document
- **Document number:** E7-15118
- **Category:** air-emissions
- **Federal Register citation:** 72 FR 43537
- **CFR reference:** 40 CFR 52
- **Publication date:** 2007-08-06
- **Effective date:** 2007-10-05
- **State:** AZ
- **EPA docket:** EPA-R09-OAR-2007-0610
## Abstract

EPA is taking direct final action to approve a revision to the Maricopa County portion of the Arizona State Implementation Plan (SIP). This revision concerns reductions of particulate matter (PM) emissions from the paving of unpaved roads and the use of these reductions to satisfy the offset requirements under the new source review provisions of the Clean Air Act as amended in 1990 (CAA or the Act). We are approving a local rule which assures that the PM emission reductions resulting from the road paving meet the criteria for valid offsets under the Act.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/08/06/E7-15118/revisions-to-the-arizona-state-implementation-plan-maricopa-county)
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