Regulation & law · 04/11/2011Updated: 10/17/2026 · 1 min read
EPA Approves Air Quality Plans for Washington D.C. and Martinsburg-Hagerstown Areas
Summary
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 →