# Limited Approval, Limited Disapproval of Arizona Air Plan Revisions, Hayden Area; Sulfur Dioxide Control Measures-Copper Smelters
> **Rule** · Final rule. · Published 2020-11-05 · Effective 2020-12-07 · 85 FR 70483
## Document
- **Document number:** 2020-23031
- **Category:** air-emissions
- **Federal Register citation:** 85 FR 70483
- **CFR reference:** 40 CFR 52
- **Publication date:** 2020-11-05
- **Effective date:** 2020-12-07
- **State:** AZ
- **EPA docket:** EPA-R09-OAR-2020-0173
## Abstract

The Environmental Protection Agency (EPA) is finalizing a limited approval and limited disapproval of a revision to the Arizona State Implementation Plan (SIP). This revision concerns sulfur dioxide (SO<INF>2</INF>) emissions from the primary copper smelter in Hayden, Arizona. Specifically, we are taking action on a local rule submitted by the Arizona Department of Environmental Quality (ADEQ) that regulates these emissions under the Clean Air Act (CAA or the Act).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/11/05/2020-23031/limited-approval-limited-disapproval-of-arizona-air-plan-revisions-hayden-area-sulfur-dioxide)
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