# Clean Air Act Reclassification; Colorado; Reclassification of the Denver Metro/North Front Range 2015 Ozone Nonattainment Area to Serious
> **Rule** · Final rule. · Published 2024-07-24 · Effective 2024-07-24 · 89 FR 59832
## Document
- **Document number:** 2024-16123
- **Category:** air-emissions
- **Federal Register citation:** 89 FR 59832
- **CFR reference:** 40 CFR 81
- **Publication date:** 2024-07-24
- **Effective date:** 2024-07-24
- **State:** CO
- **EPA docket:** EPA-R08-OAR-2024-0318
## Abstract

Under the Clean Air Act (CAA), the Environmental Protection Agency (EPA) is granting a request by the State of Colorado to reclassify the Denver Metro/North Front Range ozone nonattainment area ("DMNFR) from "Moderate" to "Serious" for the 2015 8-hour ozone national ambient air quality standards (NAAQS).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2024/07/24/2024-16123/clean-air-act-reclassification-colorado-reclassification-of-the-denver-metronorth-front-range-2015)
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