Ozone Attainment Demonstrations

This page is dedicated to Indiana's Ozone attainment demonstrations for counties that did not meet the National Ambient Air Quality Standards (NAAQS) at the time designations were made. As required by Clean Air Act (CAA) Title I, Part D, Subpart 1, Section 172, the Indiana Department of Environmental Management (IDEM) has prepared these attainment demonstrations for U.S. Environmental Protection Agency (U.S. EPA) review.