# National Primary and Secondary Ambient Air Quality Standards
> **Rule** · — · Published 2002-03-15 · 67 FR 11579
## Document
- **Document number:** 02-55506
- **Category:** air-emissions
- **Federal Register citation:** 67 FR 11579
- **CFR reference:** 40 CFR 50
- **Publication date:** 2002-03-15
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2002/03/15/02-55506/national-primary-and-secondary-ambient-air-quality-standards)
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