# Air Plan Approval; Ohio; Second Maintenance Plan for 1997 Ozone NAAQS; Dayton-Springfield
> **Rule** · Final rule. · Published 2019-10-01 · Effective 2019-10-31 · 84 FR 52001
## Document
- **Document number:** 2019-20850
- **Category:** air-emissions
- **Federal Register citation:** 84 FR 52001
- **CFR reference:** 40 CFR 52
- **Publication date:** 2019-10-01
- **Effective date:** 2019-10-31
- **State:** OH
- **EPA docket:** EPA-R05-OAR-2019-0216
## Abstract

The Environmental Protection Agency (EPA) is approving, under the Clean Air Act (CAA), Ohio's plan for maintaining the 1997 ozone National Ambient Air Quality Standard (NAAQS or standard) through 2028 in the Dayton-Springfield area. The Dayton-Springfield area consists of Clark, Greene, Miami and Montgomery Counties. The Ohio Environmental Protection Agency submitted this state implementation plan (SIP) revision to EPA on April 12, 2019.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/10/01/2019-20850/air-plan-approval-ohio-second-maintenance-plan-for-1997-ozone-naaqs-dayton-springfield)
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