# Air Plan Approval; Pennsylvania; 1997 8-Hour Ozone National Ambient Air Quality Standard (NAAQS) Second Maintenance Plan for the Altoona (Blair County) Area
> **Rule** · Final rule. · Published 2021-02-09 · Effective 2021-03-11 · 86 FR 8697
## Document
- **Document number:** 2021-02583
- **Category:** air-emissions
- **Federal Register citation:** 86 FR 8697
- **CFR reference:** 40 CFR 52
- **Publication date:** 2021-02-09
- **Effective date:** 2021-03-11
- **State:** PA
- **EPA docket:** EPA-R03-OAR-2020-0332
## Abstract

The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the Commonwealth of Pennsylvania. This revision pertains to the Commonwealth's plan, submitted by the Pennsylvania Department of Environmental Protection (PADEP), for maintaining the 1997 8-hour ozone national ambient air quality standard (NAAQS) (referred to as the "1997 ozone NAAQS") in the Altoona, Blair County, Pennsylvania area (Altoona Area). EPA is approving these revisions to the Pennsylvania SIP in accordance with the requirements of the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/02/09/2021-02583/air-plan-approval-pennsylvania-1997-8-hour-ozone-national-ambient-air-quality-standard-naaqs-second)
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