Regulation & law · 04/11/2011Updated: 10/17/2026 · 1 min read

EPA Approves Air Quality Plans for Washington D.C. and Martinsburg-Hagerstown Areas

The Environmental Protection Agency (EPA) has determined that the Washington D.C. and Martinsburg-Hagerstown areas have met the 1997 fine particle standard, based on air quality monitoring data from 2007-2009.

Original source language: Federal Register — All DocumentsOpen original release →

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