# National Ambient Air Quality Standards for Particulate Matter
> **Rule** · Final rule. · Published 2004-07-30 · Effective 2004-07-30 · 69 FR 45592
## Document
- **Document number:** 04-17372
- **Category:** air-emissions
- **Federal Register citation:** 69 FR 45592
- **CFR reference:** 40 CFR 50
- **Publication date:** 2004-07-30
- **Effective date:** 2004-07-30
- **EPA docket:** OAR-2003-0229
## Abstract

In American Trucking Associations v. EPA, 175 F. 3d 1027 (D.C. Cir. 1999), the court vacated the PM<INF>10</INF> national ambient air quality standards (NAAQS) that EPA adopted in 1997. Today's action removes the vacated 1997 PM<INF>10</INF> standards and related requirements from the Code of Federal Regulations (CFR).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/07/30/04-17372/national-ambient-air-quality-standards-for-particulate-matter)
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