Illinois. Bureau of Air
This is a list of all documents accepted for permanent retention in the depository, in order by issuing agency.
- Illinois Annual Air Quality Report {periodical start}
Annual report of the air quality index levels in Illinois. - Technical support document for recommended nonattainment boundaries in Illinois for the 24-hour PM2.5 National Ambient Air Quality Standard [AQPSTR 07-04]
This report provides the basis for recommendations by the Illinois Environmental Protection Agency (IEPA) for attainment nonattainment designation boundaries for all areas in the State of Illinois for the 24-hour PM2.5 standard. Based on the most recent three years of ambient monitoring data (2004-2006), only three counties in Illinois are currently violating the 24-hour PM2.5 NAAQS, Cook, Will and Madison counties. Based on an analysis of the factors contained in federal guidance, the IEPA is recommending that portions of the Chicago and Metro-East metropolitan areas be designated as nonattainment for the 24-hour PM2.5 standard. The recommended boundaries also reflect U.S. EPA guidance to show that: 1) violations are not occurring in the excluded portions of the recommended area and 2) the excluded portions do not contain emission sources that contribute to the observed violations. The remaining areas of Illinois should be classified as attainment areas for the PM2.5 standard.