# Air Plan Approval; Arizona; Maricopa County Air Quality Department and Pima County Department of Environmental Quality
> **Rule** · Final rule. · Published 2020-07-15 · Effective 2020-08-14 · 85 FR 42726
## Document
- **Document number:** 2020-14001
- **Category:** air-emissions
- **Federal Register citation:** 85 FR 42726
- **CFR reference:** 40 CFR 52
- **Publication date:** 2020-07-15
- **Effective date:** 2020-08-14
- **State:** AZ
- **EPA docket:** EPA-R09-OAR-2019-0633
## Abstract

The Environmental Protection Agency (EPA) is taking final action to approve revisions to the Maricopa County Air Quality Department (MCAQD) and Pima County Department of Environmental Quality (PCDEQ) portions of the Arizona State Implementation Plan (SIP). These revisions concern emissions of particulate matter (PM) from nonmetallic mineral processing, inactive mineral tailings and slag storage. We are approving local rules that regulate these emission sources under the Clean Air Act (CAA or the Act).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/07/15/2020-14001/air-plan-approval-arizona-maricopa-county-air-quality-department-and-pima-county-department-of)
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