The ink is barely dry on the reclassification of the Chicago ozone nonattainment area from moderate to serious, under the 2008 ozone National Ambient Air Quality Standards (NAAQS), and the Illinois Environmental Protection Agency (IEPA) intends to seek redesignation to attainment.  According to IEPA staff, the agency has data supporting a request for redesignation to

The Chicago-Naperville, IL-IN-WI ozone nonattainment area failed to attain the 2008 ozone NAAQS by the attainment date of July 20, 2018.   The area, which is currently classified as “Moderate” for the 2008 ozone NAAQS, will automatically be bumped-up to a “Serious” classification upon the effective date of the final reclassification notice.  The Chicago area joins