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Indiana Department of Environmental Management

Air Quality in Indiana

Air Quality in Indiana > Nonattainment > Nonattainment Designations > Sulfur Dioxide (SO2) Nonattainment Designations Sulfur Dioxide (SO2) Nonattainment Designations

This web page is dedicated to Indiana's Nonattainment area designations for counties that do not meet, or that contribute to violations of , the National Ambient Air Quality Standards (NAAQS) for one-hour SO2. Nonattainment areas are regions within the country where the concentration of one or more criteria pollutants exceeds the level set as the federal air quality standard.

SO2 Designation Documents

Rounds 3 and 4 Nonattainment Designations

Round 2 Nonattainment Designations

Round 1 Nonattainment Designations