# Ambient Air Quality Surveillance
> **Rule** · — · Published 2009-06-26 · 74 FR 30469
## Document
- **Document number:** E9-15326
- **Category:** air-emissions
- **Federal Register citation:** 74 FR 30469
- **CFR reference:** 40 CFR 58
- **Publication date:** 2009-06-26
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/06/26/E9-15326/ambient-air-quality-surveillance)
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