# Approval and Promulgation of Air Quality Implementation Plans; District of Columbia, Maryland, Virginia, and West Virginia; Determinations of Attainment of the 1997 Fine Particle Standard for the Metropolitan Washington, DC-MD-VA and Martinsburg-Hagerstown, WV-MD Nonattainment Areas
> **Rule** · Final rule. · Published 2012-01-10 · Effective 2012-02-09 · 77 FR 1411
## Document
- **Document number:** 2012-141
- **Category:** air-emissions
- **Federal Register citation:** 77 FR 1411
- **CFR reference:** 40 CFR 52
- **Publication date:** 2012-01-10
- **Effective date:** 2012-02-09
- **State:** MD
- **EPA docket:** EPA-R03-OAR-2011-0801
## Abstract

EPA is making determinations that the Metropolitan Washington, District of Columbia-Maryland-Virginia (DC-MD-VA) fine particle (PM<INF>2.5</INF>) nonattainment area and the Martinsburg-Hagerstown, West Virginia-Maryland (WV-MD) PM<INF>2.5</INF> nonattainment area (hereafter referred to as "Areas") have attained the 1997 annual PM<INF>2.5</INF> National Ambient Air Quality Standard (NAAQS) by their applicable attainment date of April 5, 2010. These determinations are based upon complete, quality-assured, and certified ambient air monitoring data for the 2007-2009 monitoring period. EPA is finding these Areas to be in attainment, in accordance with the requirements of the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/01/10/2012-141/approval-and-promulgation-of-air-quality-implementation-plans-district-of-columbia-maryland-virginia)
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