# Designation of Areas for Air Quality Planning Purposes
> **Rule** · — · Published 2025-07-29 · 90 FR 35619
## Document
- **Document number:** 2025-14315
- **Category:** air-emissions
- **Federal Register citation:** 90 FR 35619
- **CFR reference:** 40 CFR 81
- **Publication date:** 2025-07-29
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/07/29/2025-14315/designation-of-areas-for-air-quality-planning-purposes)
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