# Initial Air Quality Designations for the 2024 Revised Primary Annual Fine Particle (PM2.5) National Ambient Air Quality Standards (NAAQS)

**Action Urgency Score:** 55/100

| Field | Value |
|---|---|
| Agency | Environmental Protection Agency |
| Type | Proposed rule |
| Action | Notice of availability; opportunity for public comment. |
| Published | 2026-10-06 |
| Comments close | 2026-11-05 |
| Significant | No |
| CFR parts | 40 CFR 81 |
| Summary | The U.S. Environmental Protection Agency (EPA) is providing notice of the Agency's intended approach for area designations for the 2024 primary annual fine particulate matter (PM<INF>2.5</INF>) National Ambient Air Quality Standard (NAAQS) (the 2024 annual PM<INF>2.5</INF> NAAQS) under Clean Air Act (CAA) section 107(d). Details regarding these designations, as well as the EPA's notifications to States, territories, and Tribes regarding their initial area designations are accessible via the Agency's website and public electronic docket. With this notice, the EPA is providing an opportunity for |
| Document number | 2026-20468 |

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

Source: Federal Register API (Office of the Federal Register) (https://www.federalregister.gov/documents/2026/10/06/2026-20468/initial-air-quality-designations-for-the-2024-revised-primary-annual-fine-particle-pm25-national). Last refreshed: 2026-11-03T19:10:06.902Z.
Data from the Federal Register API; the published Federal Register document is authoritative. Informational only, not legal advice.