# Air Plan Disapproval; Colorado; RACT Elements for the 2008 8-Hour Ozone Standard for the Denver Metro/North Front Range Nonattainment Area
> **Rule** · Final rule. · Published 2023-12-08 · Effective 2024-01-08 · 88 FR 85511
## Document
- **Document number:** 2023-26949
- **Category:** air-emissions
- **Federal Register citation:** 88 FR 85511
- **CFR reference:** 40 CFR 52
- **Publication date:** 2023-12-08
- **Effective date:** 2024-01-08
- **State:** CO
- **EPA docket:** EPA-R08-OAR-2023-0272
## Abstract

The Environmental Protection Agency (EPA) is disapproving portions of a state implementation plan (SIP) revision submitted by the State of Colorado to meet Clean Air Act (CAA) requirements for the 2008 8-hour ozone national ambient air quality standards (NAAQS) in the Denver Metro/North Front Range nonattainment area (DMNFR Area). Specifically, the EPA is disapproving certain reasonably available control technology (RACT) SIP submittals.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2023/12/08/2023-26949/air-plan-disapproval-colorado-ract-elements-for-the-2008-8-hour-ozone-standard-for-the-denver)
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