# Approval and Promulgation of Implementation Plans-Pinal County (Part); West Pinal, AZ PM10 Nonattainment Area; Moderate Area, Serious Area, and Section 189(d) Plan for Attainment of the 24-Hour PM10 Standard

**Action Urgency Score:** 55/100

| Field | Value |
|---|---|
| Agency | Environmental Protection Agency |
| Type | Proposed rule |
| Action | Proposed rule. |
| Published | 2026-10-19 |
| Comments close | 2026-11-18 |
| Significant | No |
| CFR parts | 40 CFR 52 |
| Summary | The U.S. Environmental Protection Agency (EPA) is proposing to approve a state implementation plan (SIP) revision submitted by the State of Arizona to meet Clean Air Act (CAA or "Act") requirements applicable to the Pinal County (Part); West Pinal PM<INF>10</INF> nonattainment area ("West Pinal County PM<INF>10</INF> Nonattainment Area"). The EPA is proposing to find that the submitted SIP revision meets all applicable "Moderate" area, "Serious" area, and CAA section 189(d) requirements for the PM<INF>10</INF> national ambient air quality standards (NAAQS). Additionally, the EPA is proposing t |
| Document number | 2026-21288 |

## Why this score
- Comment deadline within 30 days.

Source: Federal Register API (Office of the Federal Register) (https://www.federalregister.gov/documents/2026/10/19/2026-21288/approval-and-promulgation-of-implementation-plans-pinal-county-part-west-pinal-az-pm10-nonattainment). Last refreshed: 2026-11-04T09:17:43.641Z.
Data from the Federal Register API; the published Federal Register document is authoritative. Informational only, not legal advice.