Regulation & law · 05/09/2014Updated: 10/17/2026 · 1 min read

EPA Responds to Sierra Club Petition to Redesignate Ozone Nonattainment Areas

The U.S. Environmental Protection Agency has denied a petition from the Sierra Club to redesignate 57 areas with ozone levels exceeding 2008 national standards, and set specific boundaries for these areas, following a decision made on August 14, 2014.