Regulation & law · 25/10/1999Updated: 10/17/2026 · 1 min read

EPA Proposes to Rescind Findings on 1-Hour Ozone Standard

The Environmental Protection Agency (EPA) is proposing to rescind its prior findings that the 1-hour ozone national ambient air quality standard no longer applies in certain areas, following a recent ruling from the U.S. Court of Appeals for the District of Columbia Circuit that undermines the basis for EPA's previous determinations.