# Approval of Arizona Air Plan Revisions; Phoenix, Arizona; Second 10-Year Carbon Monoxide Maintenance Plan
> **Rule** · Final rule. · Published 2016-03-03 · Effective 2016-04-04 · 81 FR 11120
## Document
- **Document number:** 2016-04614
- **Category:** air-emissions
- **Federal Register citation:** 81 FR 11120
- **CFR reference:** 40 CFR 52
- **Publication date:** 2016-03-03
- **Effective date:** 2016-04-04
- **State:** AZ
- **EPA docket:** EPA-R09-OAR-2015-0645
## Abstract

The Environmental Protection Agency (EPA) is taking final action to approve a revision to the Arizona State Implementation Plan (SIP). This revision is the second ten-year maintenance plan for carbon monoxide (CO) for the Phoenix metropolitan area in Maricopa County, Arizona. We are also finding adequate and approving transportation conformity motor vehicle emissions budgets (MVEB) for the year 2025 and beyond. We are taking these actions under the Clean Air Act (CAA or the Act).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2016/03/03/2016-04614/approval-of-arizona-air-plan-revisions-phoenix-arizona-second-10-year-carbon-monoxide-maintenance)
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