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IDEM > Monitoring > Air Monitoring > Attainment and Redesignations > Sulfur Dioxide Designation Process Sulfur Dioxide Designation Process

This Web site is dedicated to Indiana's Nonattainment area designations for counties that do not meet or 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 standards.

SO2 Designation Status

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