# 2026-16083: EPA split-decides Arizona's dusty air quality tweaks

2026-16083, Partial Approval and Partial Disapproval of Air Quality State Implementation Plans; Arizona; Prevention of Significant Deterioration Infrastructure Requirements for the 2012 Fine Particulate Matter National Ambient Air Quality Standard, is a Federal Register proposed rule from Environmental Protection Agency published 2026-08-06, effective 2026-09-08 (as of 2026-08-13).

- Canonical: https://policyrisk.com/federal-register/2026-16083
- As of: 2026-08-13
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-16083
- Title: Partial Approval and Partial Disapproval of Air Quality State Implementation Plans; Arizona; Prevention of Significant Deterioration Infrastructure Requirements for the 2012 Fine Particulate Matter National Ambient Air Quality Standard
- Type: Proposed Rule
- Agencies: Environmental Protection Agency
- Citation: 91 FR 50742
- Published: 2026-08-06
- Effective: 2026-09-08
- Comments close: 2024-06-13
- Significant: no
- Touches household money: no
- Regulation identifier numbers: none
- Last updated: 2026-08-13

## In one line

EPA split-decides Arizona's dusty air quality tweaks

## Summary

The Environmental Protection Agency (EPA) is proposing to partially approve and partially disapprove a revision to the Arizona State implementation plan (SIP) as meeting the requirements of the Clean Air Act (CAA) for the implementation, maintenance, and enforcement of the 2012 fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standard (NAAQS or "standards"). The EPA is proposing to approve the portions of Arizona's submission addressing prevention of significant deterioration (PSD) requirements in the permitting jurisdictions of the Arizona Department of Environmental Quality (ADEQ), Maricopa County Air Quality Department (MCAQD), and Pinal County Air Quality Control District (PCAQCD). The EPA is proposing to disapprove the portions of the Arizona submission addressing PSD requirements in the Pima County Department of Environmental Quality (PDEQ) permitting jurisdiction.

## Effects PRIA read

No economic effects identified for this document.

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## Sources
- [2026-16083 on federalregister.gov](https://www.federalregister.gov/documents/2026/08/06/2026-16083/partial-approval-and-partial-disapproval-of-air-quality-state-implementation-plans-arizona)
- [2026-16083 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-08-06/pdf/2026-16083.pdf)

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Source: PRIA, https://policyrisk.com/federal-register/2026-16083 (as of 2026-08-13).