# Designation of Areas for Air Quality Planning Purposes; Redesignation Request and Associated Maintenance Plan for Whatcom County, WA 2010 SO2 Nonattainment Area
> **Rule** · Final rule. · Published 2024-12-17 · Effective 2025-01-16 · 89 FR 101896
## Document
- **Document number:** 2024-29575
- **Category:** air-emissions
- **Federal Register citation:** 89 FR 101896
- **CFR reference:** 40 CFR 52
- **Publication date:** 2024-12-17
- **Effective date:** 2025-01-16
- **EPA docket:** EPA-R10-OAR-2024-0371
## Abstract

On July 25, 2024, the State of Washington (WA) submitted a request for the Environmental Protection Agency (EPA) to redesignate to attainment a portion of Whatcom County immediately surrounding the now permanently closed aluminum smelter, Intalco Aluminum LLC, which the EPA designated nonattainment for the 2010 1-hour primary sulfur dioxide (SO<INF>2</INF>) National Ambient Air Quality Standard (NAAQS). Washington also submitted a request for the EPA to approve a State Implementation Plan (SIP) revision containing a maintenance plan for the area. The EPA is taking the following final actions: we have determined that the Whatcom County (partial) SO<INF>2</INF> nonattainment area (Whatcom County area or area) is attaining the 2010 1-hour primary SO<INF>2</INF> NAAQS; we are approving Washington's plan for maintaining attainment of the 2010 1- hour primary SO<INF>2</INF> NAAQS in the area; and we are redesignating the Whatcom County area to attainment for the 2010 1-hour primary SO<INF>2</INF> NAAQS.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2024/12/17/2024-29575/designation-of-areas-for-air-quality-planning-purposes-redesignation-request-and-associated)
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