# Air Plan Approval; Revisions to Colorado Common Provisions Regulation
> **Rule** · Final rule. · Published 2024-12-27 · Effective 2025-01-27 · 89 FR 105461
## Document
- **Document number:** 2024-30695
- **Category:** air-emissions
- **Federal Register citation:** 89 FR 105461
- **CFR reference:** 40 CFR 52
- **Publication date:** 2024-12-27
- **Effective date:** 2025-01-27
- **State:** CO
- **EPA docket:** EPA-R08-OAR-2024-0207
## Abstract

The Environmental Protection Agency (EPA) is approving revisions to the Common Provisions Regulation of the Colorado State Implementation Plan (SIP). These revisions were submitted by the State of Colorado in response to the EPA's June 12, 2015, Findings of Substantial Inadequacy and "SIP calls" for certain provisions in the SIP related to affirmative defenses applicable to excess emissions during startup, shutdown, and malfunction (SSM) events. The EPA is approving these SIP revisions because the Agency has determined that they are in accordance with the requirements for SIP provisions under the Clean Air Act (CAA or the Act).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2024/12/27/2024-30695/air-plan-approval-revisions-to-colorado-common-provisions-regulation)
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