Regulation & law · 08/11/2001Updated: 10/17/2026 · 1 min read

EPA Approves Indiana's Air Quality Implementation Plan to Reduce Oxides of Nitrogen Emissions

The Environmental Protection Agency (EPA) has approved Indiana's plan to control emissions of oxides of nitrogen (NOx) in the state, which will contribute to meeting the 1-hour ozone standard in several nonattainment areas, including Chicago-Gary-Lake County and Louisville.