# Approval and Promulgation of Implementation Plans; Colorado; Revisions to Code of Colorado Regulations; Regulation Number 3
> **Rule** · — · Published 2023-03-29 · 88 FR 18426
## Document
- **Document number:** C1-2023-06120
- **Category:** other
- **Federal Register citation:** 88 FR 18426
- **CFR reference:** 40 CFR 52
- **Publication date:** 2023-03-29
- **State:** CO
- **EPA docket:** EPA-R08-OAR-2022-0612
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2023/03/29/C1-2023-06120/approval-and-promulgation-of-implementation-plans-colorado-revisions-to-code-of-colorado-regulations)
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*MORVS · CC0 1.0*