# Approval and Promulgation of Air Quality Implementation Plans; the Metropolitan Washington Nonattainment Area; Determination of Attainment of the Fine Particle Standard
> **Rule** · Final rule. · Published 2009-01-12 · Effective 2009-01-12 · 74 FR 1146
## Document
- **Document number:** E8-31305
- **Category:** air-emissions
- **Federal Register citation:** 74 FR 1146
- **CFR reference:** 40 CFR 52
- **Publication date:** 2009-01-12
- **Effective date:** 2009-01-12
- **State:** WA
- **EPA docket:** EPA-R03-OAR-2008-0736
## Abstract

EPA is determining that the Metropolitan Washington, DC-MD-VA nonattainment area for the 1997 fine particle (PM<INF>2.5</INF>) National Ambient Air Quality Standard (NAAQS) has attained the 1997 PM<INF>2.5</INF> NAAQS.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/01/12/E8-31305/approval-and-promulgation-of-air-quality-implementation-plans-the-metropolitan-washington)
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