Energy & environment · 09/11/2010Updated: 10/17/2026 · 1 min read
EPA Proposes One-Year Extension for Attaining 1997 Ozone Standard in Philadelphia Area
The Environmental Protection Agency (EPA) is proposing to extend the deadline for the Delaware, Maryland, and Pennsylvania portions of the Philadelphia-Wilmington-Atlantic City Moderate Nonattainment Area to meet the 1997 8-hour ozone national ambient air quality standard (NAAQS), citing improved air quality data from the 2009 ozone season.