# Designation of Areas for Air Quality Planning Purposes
> **Rule** · — · Published 2001-04-13 · 66 FR 19095
## Document
- **Document number:** 01-55512
- **Category:** air-emissions
- **Federal Register citation:** 66 FR 19095
- **CFR reference:** 40 CFR 81
- **Publication date:** 2001-04-13
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/04/13/01-55512/designation-of-areas-for-air-quality-planning-purposes)
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