# Determination of Attainment by the Attainment Date; 1997 Ozone Standards; California; Coachella Valley

**Action Urgency Score:** 30/100

| Field | Value |
|---|---|
| Agency | Environmental Protection Agency |
| Type | Final rule |
| Action | Final rule. |
| Published | 2026-08-13 |
| Effective | 2026-09-14 |
| Significant | No |
| CFR parts | 40 CFR 52 |
| Summary | The Environmental Protection Agency (EPA) is taking final action to determine that the Riverside County (Coachella Valley), CA 1997 ozone "Extreme" nonattainment area attained the revoked 1997 ozone national ambient air quality standards (NAAQS) by its June 15, 2025 attainment date. This determination is based on quality-assured and certified ambient air quality monitoring data from 2022 through 2024. |
| Document number | 2026-16511 |

## Why this score
- Final rule.

Source: Federal Register API (Office of the Federal Register) (https://www.federalregister.gov/documents/2026/08/13/2026-16511/determination-of-attainment-by-the-attainment-date-1997-ozone-standards-california-coachella-valley). Last refreshed: 2026-11-04T21:40:49.974Z.
Data from the Federal Register API; the published Federal Register document is authoritative. Informational only, not legal advice.