# Air Plan Approval and Air Quality Designation; TN; Attainment Plan and Redesignation of the Sullivan County Nonattainment Area for the 2010 1-Hour Primary SO2 NAAQS

**Action Urgency Score:** 55/100

| Field | Value |
|---|---|
| Agency | Environmental Protection Agency |
| Type | Proposed rule |
| Action | Proposed rule. |
| Published | 2026-10-29 |
| Comments close | 2026-11-30 |
| Significant | No |
| CFR parts | 40 CFR 52, 40 CFR 81 |
| Summary | The U.S. Environmental Protection Agency (EPA or Agency) is proposing to approve the State of Tennessee's attainment plan for the Sullivan County Nonattainment Area (Sullivan County Area or Area) for the 2010 Sulfur Dioxide (SO<INF>2</INF>) National Ambient Air Quality Standards (NAAQS). Additionally, the EPA is proposing to determine that the Area has attained the 2010 SO<INF>2</INF> NAAQS and to approve Tennessee's maintenance plan for continued attainment. With these approvals, the EPA is proposing to approve Tennessee's comprehensive source-specific SO<INF>2</INF> permitted limits for two  |
| Document number | 2026-22063 |

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

Source: Federal Register API (Office of the Federal Register) (https://www.federalregister.gov/documents/2026/10/29/2026-22063/air-plan-approval-and-air-quality-designation-tn-attainment-plan-and-redesignation-of-the-sullivan). 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.