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Air Quality in Indiana

Air Quality in Indiana > Nonattainment > Nonattainment Designations > Ozone (O3) Nonattainment Designations Ozone (O3) Nonattainment Designations

This webpage is dedicated to Indiana’s area designations for counties that do not meet the National Ambient Air Quality Standards (NAAQS) for ozone. Nonattainment areas are regions within the country where the concentration of one or more of the criteria pollutants exceeds the level set as the federal air quality standard.

2008 Revised Ozone Standard

2008 Revised Ozone Nonattainment Recommendations

June 11, 2012
May 21, 2012
April 13, 2012
January 31, 2012
December 9, 2011
March 11, 2009