# 2024-31028: Air Plan Revisions; Arizona; Maricopa County Air Quality Department

2024-31028, Air Plan Revisions; Arizona; Maricopa County Air Quality Department, is a Federal Register rule from an unnamed agency published 2025-01-10, effective 2025-02-10 (as of 2026-06-11).

- Canonical: https://policyrisk.com/federal-register/2024-31028
- As of: 2026-06-11
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2024-31028
- Title: Air Plan Revisions; Arizona; Maricopa County Air Quality Department
- Type: Rule
- Agencies: unknown
- Citation: unknown
- Published: 2025-01-10
- Effective: 2025-02-10
- Comments close: not stated
- Significant: no
- Touches household money: no
- Regulation identifier numbers: none
- Last updated: 2026-06-11

## Summary

The EPA is updating air pollution rules for Maricopa County, Arizona, focusing on cutting harmful gas leaks from loading organic liquids and gasoline. They’re approving some local rules but also asking Arizona to fix parts that don’t fully meet clean air standards. These changes kick in on February 10, 2025, aiming to keep the air cleaner around Phoenix and Mesa without extra costs right now.

## Abstract

The Environmental Protection Agency (EPA) is finalizing a limited approval and limited disapproval of revisions to the Maricopa County Air Quality Department (MCAQD or "County") portion of the Arizona State Implementation Plan (SIP). These revisions concern emissions of volatile organic compounds (VOCs) from loading of organic liquids and gasoline. Under the authority of the Clean Air Act (CAA or "Act"), this action simultaneously approves local rules that regulate these emission sources and directs Arizona to correct rule deficiencies. We are also finalizing a disapproval of MCAQD's reasonably available control technology (RACT) demonstration for the source categories associated with these rules for the 2008 8-hour ozone national ambient air quality standard (NAAQS) in the Phoenix-Mesa ozone nonattainment area.

## Effects PRIA read

- Maricopa Rules Made Federally Enforceable: mixed, medium. If you operate gasoline cargo tanks or gasoline dispensing facilities in Maricopa County, EPA incorporated MCAQD Rule 352 and Rule 353 into the Arizona State Implementation Plan and made them federally enforceable under the Clean Air Act as of February 10, 2025. Those rules regulate volatile organi…
- RACT Disapproval Triggers FIP/Sanction Deadlines: cost, medium. EPA finalized a limited disapproval of Maricopa County's RACT demonstration for gasoline tank trucks and Stage I vapor control systems. If Arizona does not correct the identified deficiencies within 24 months (by February 10, 2027), EPA must promulgate a Federal Implementation Plan; an offset sanct…
- Local Rules Can Still Be Enforced Locally: benefit, low. EPA noted that its limited disapproval does not stop the Maricopa County Air Quality Department from enforcing Rules 352 and 353 at the local level, and portions of the rules may still be incorporated into the federally enforceable SIP. EPA also states this action does not add requirements beyond s…

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## Sources
- [2024-31028 on federalregister.gov](https://www.federalregister.gov/documents/2025/01/10/2024-31028/air-plan-revisions-arizona-maricopa-county-air-quality-department)
- [2024-31028 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2025-01-10/pdf/2024-31028.pdf)

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Source: PRIA, https://policyrisk.com/federal-register/2024-31028 (as of 2026-06-11).