# Air Plan Approval; Oklahoma; Interstate Transport Requirements for the 2010 SO2 NAAQS

**Action Urgency Score:** 65/100

| Field | Value |
|---|---|
| Agency | Environmental Protection Agency |
| Type | Final rule |
| Action | Final rule. |
| Published | 2026-10-08 |
| Effective | 2026-11-09 |
| Significant | No |
| CFR parts | 40 CFR 52 |
| Summary | Pursuant to the Federal Clean Air Act (CAA or the Act), the U.S. Environmental Protection Agency (EPA) is approving portions of the State Implementation Plan (SIP) submittal from the State of Oklahoma demonstrating that the State satisfies the interstate transport requirements of the CAA for the 2010 1-hour sulfur dioxide (SO<INF>2</INF>) primary National Ambient Air Quality Standard (NAAQS). This provision requires each State's implementation plan to contain adequate requirements prohibiting the interstate transport of air pollution in amounts that will contribute significantly to nonattainme |
| Document number | 2026-20640 |

## Why this score
- Effective date within 30 days.
- Final rule.

Source: Federal Register API (Office of the Federal Register) (https://www.federalregister.gov/documents/2026/10/08/2026-20640/air-plan-approval-oklahoma-interstate-transport-requirements-for-the-2010-so2-naaqs). 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.