- Skip Navigation

Note: This message is displayed if (1) your browser is not standards-compliant or (2) you have you disabled CSS. Read our Policies for more information.

Air Quality in Indiana

Air Quality in Indiana > Redesignation Redesignation

Areas that are designated nonattainment under a National Ambient Air Quality Standard (NAAQS) are eligible to be redesignated to attainment once they meet a specified set of criteria, which includes monitoring attainment of the standard it was designated under. Once eligible, the Indiana Department of Environmental Management (IDEM) can petition the United States Environmental Protection Agency (U.S. EPA) for the area to be redesignated to attainment and classified as maintenance.