Particulate Matter (PM 2.5) Air Quality Attainment/Nonattainment Designations

All National Ambient Air Quality Standards (NAAQS) undergo periodic review and may be revised to reflect the latest health, environmental and technological advances. When a new standard is promulgated or an existing standard is revised, the first step in implementation is to determine which areas are, or are not, violating the NAAQS or are contributing to a violation of the NAAQS. During the “designation process,” states have the opportunity to submit data and recommendations, which U.S. EPA reviews and considers before issuing final designations. Following are documents relating to Indiana’s air quality designation process for the particulate matter NAAQS.

Annual PM 2.5 Nonattainment Designations

April 7, 2015
January 14, 2015
December 18, 2014
October 22, 2014
August 19, 2014
May 12, 2014
December 12, 2013

24 Hour PM 2.5 Nonattainment Designations

February 18, 2009
December 22, 2008
October 20, 2008
October 2, 2008
August 18, 2008
June 13, 2008
May 30, 2008
December 17, 2007