# Air Plan Approval; Arizona; Miami Copper Smelter Sulfur Dioxide Control Measures
> **Rule** · Final rule. · Published 2021-05-10 · Effective 2021-06-09 · 86 FR 24726
## Document
- **Document number:** 2021-09634
- **Category:** air-emissions
- **Federal Register citation:** 86 FR 24726
- **CFR reference:** 40 CFR 52
- **Publication date:** 2021-05-10
- **Effective date:** 2021-06-09
- **State:** AZ
- **EPA docket:** EPA-R09-OAR-2020-0735
## Abstract

The Environmental Protection Agency (EPA) is taking final action to approve a revision to the Arizona State Implementation Plan (SIP). This revision concerns emissions of sulfur dioxide (SO<INF>2</INF>) from the copper smelter in Miami, Arizona. We are approving the rescission of two Arizona Department of Environmental Quality (ADEQ) Arizona Administrative Code (A.A.C.) provisions from the Arizona SIP that are no longer needed to regulate this emission source under the Clean Air Act (CAA or the "Act").

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/05/10/2021-09634/air-plan-approval-arizona-miami-copper-smelter-sulfur-dioxide-control-measures)
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