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IDEM > Monitoring > Air Monitoring > Attainment and Redesignations > Ozone and Fine Particle Nonattainment Designations Ozone and Fine Particle Nonattainment Designations

This Web site is dedicated to Indiana's Nonattainment area designations for counties that do not meet the National Ambient Air Quality Standards (NAAQS). 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.

Ozone Nonattainment Designations

2008 Revised Ozone Standard

2008 Revised Ozone Nonattainment Recommendations

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

PM2.5 Designations

Annual PM 2.5 Nonattainment Designations

24-Hour PM 2.5 Nonattainment Designations

February 18, 2009
December 22, 2008
October 20, 2008
October 2, 2008
August 19, 2008
June 9, 2008
May 30, 2008
December 17, 2007

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