Regulation & law · 14/08/2025

EPA Approves Revisions to Indiana State Implementation Plan for Huntington County Sulfur Dioxide Attainment Area

The Environmental Protection Agency (EPA) has determined that the Huntington County, Indiana nonattainment area failed to meet the 2010 Sulfur Dioxide National Ambient Air Quality Standard by the April 9, 2023 deadline. The EPA is approving revisions to the Indiana State Implementation Plan to help the area attain the standard.