# Air Plan Partial Approval and Partial Conditional Approval; South Carolina; Control of Oxides of Nitrogen and Source Testing Requirements

**Action Urgency Score:** 20/100

| Field | Value |
|---|---|
| Agency | Environmental Protection Agency |
| Type | Proposed rule |
| Action | Proposed rule. |
| Published | 2026-08-19 |
| Comments close | 2026-09-18 |
| Significant | No |
| CFR parts | 40 CFR 52 |
| Summary | The U.S. Environmental Protection Agency (EPA or Agency) is proposing to partially approve and partially conditionally approve changes to South Carolina's State Implementation Plan (SIP) to revise source testing requirements and regulations prescribing control requirements for certain stationary sources of nitrogen oxides (NO<INF>X</INF>) submitted by the State of South Carolina, through the South Carolina Department of Environmental Services (SC DES), on October 1, 2007; July 27, 2016; September 5, 2017; April 24, 2020; and February 4, 2022. This action is being proposed pursuant to the Clean |
| Document number | 2026-16932 |

## Why this score


Source: Federal Register API (Office of the Federal Register) (https://www.federalregister.gov/documents/2026/08/19/2026-16932/air-plan-partial-approval-and-partial-conditional-approval-south-carolina-control-of-oxides-of). 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.