# Air Plan Approval; Iowa; Interstate Transport Requirements for the 2010 Sulfur Dioxide Standard

**Action Urgency Score:** 20/100

| Field | Value |
|---|---|
| Agency | Environmental Protection Agency |
| Type | Proposed rule |
| Action | Proposed rule. |
| Published | 2026-08-14 |
| Comments close | 2026-09-14 |
| Significant | No |
| CFR parts | 40 CFR 52 |
| Summary | The Environmental Protection Agency (EPA) is proposing to approve the State Implementation Plan (SIP) submission from Iowa addressing the Clean Air Act (CAA or Act) interstate transport requirements, also known as the "good neighbor" provision, for the 2010 1-hour primary sulfur dioxide (SO<INF>2</INF>) National Ambient Air Quality Standard (NAAQS). The good neighbor provision requires each State's plan to contain adequate provisions prohibiting the interstate transport of air pollution in amounts that will contribute significantly to nonattainment, or interfere with maintenance, of a NAAQS in |
| Document number | 2026-16570 |

## Why this score


Source: Federal Register API (Office of the Federal Register) (https://www.federalregister.gov/documents/2026/08/14/2026-16570/air-plan-approval-iowa-interstate-transport-requirements-for-the-2010-sulfur-dioxide-standard). 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.