# Redesignation of Portions of Westmoreland and Cambria Counties, Pennsylvania for the 2010 Sulfur Dioxide (SO2) National Ambient Air Quality Standards (NAAQS)
> **Rule** · Final rule. · Published 2024-12-17 · Effective 2025-01-16 · 89 FR 101910
## Document
- **Document number:** 2024-29229
- **Category:** air-emissions
- **Federal Register citation:** 89 FR 101910
- **CFR reference:** 40 CFR 81
- **Publication date:** 2024-12-17
- **Effective date:** 2025-01-16
- **State:** PA
- **EPA docket:** EPA-R03-OAR-2023-0419
## Abstract

The Environmental Protection Agency (the EPA or the Agency) is finalizing the redesignation of portions of Cambria County and Westmoreland County, Pennsylvania, to "nonattainment" for the 2010 1- hour primary sulfur dioxide (SO<INF>2</INF>) national ambient air quality standard (NAAQS or standard). Westmoreland County was previously designated "attainment/ unclassifiable," and Cambria County was designated "unclassifiable." The EPA notified the Commonwealth of Pennsylvania of its intended redesignation of portions of Cambria and Westmoreland counties on February 17, 2023, and published a Notice of Availability (NOA) for this action on February 12, 2024. The EPA's redesignation of portions of these counties is based on modeled violations of the 2010 1-hour primary SO<INF>2</INF> NAAQS.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2024/12/17/2024-29229/redesignation-of-portions-of-westmoreland-and-cambria-counties-pennsylvania-for-the-2010-sulfur)
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