# Air Plan Approval; Iowa; State Implementation Plan and Operating Permits Program
> **Rule** · — · Published 2020-03-20 · 85 FR 15959
## Document
- **Document number:** 2020-05998
- **Category:** other
- **Federal Register citation:** 85 FR 15959
- **CFR reference:** 40 CFR 52
- **Publication date:** 2020-03-20
- **State:** IA
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/03/20/2020-05998/air-plan-approval-iowa-state-implementation-plan-and-operating-permits-program)
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