# Approval and Promulgation of Implementation Plans
> **Rule** · — · Published 2023-02-23 · 88 FR 11396
## Document
- **Document number:** 2023-03689
- **Category:** other
- **Federal Register citation:** 88 FR 11396
- **CFR reference:** 40 CFR 52
- **Publication date:** 2023-02-23
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2023/02/23/2023-03689/approval-and-promulgation-of-implementation-plans)
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