# Approval and Promulgation of Implementation Plans; Arizona Maricopa Nonattainment Area; Carbon Monoxide
> **Rule** · Final rule. · Published 1996-10-03 · 61 FR 51599
## Document
- **Document number:** 96-25400
- **Category:** air-emissions
- **Federal Register citation:** 61 FR 51599
- **CFR reference:** 40 CFR 52
- **Publication date:** 1996-10-03
- **State:** AZ
- **EPA docket:** AZ033-0007 FRL-5628-6
## Abstract

EPA is approving contingency measures adopted pursuant to the Clean Air Act (CAA) and submitted to EPA by the State of Arizona as revisions to the Arizona State Implementation Plan (SIP) for the Maricopa (Phoenix) carbon monoxide (CO) nonattainment area. Based on the approval of these measures, EPA is withdrawing its federal contingency process for the Maricopa area and its proposed list of highway projects subject to delay.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1996/10/03/96-25400/approval-and-promulgation-of-implementation-plans-arizona-maricopa-nonattainment-area-carbon)
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