| | 1: | | Title: | | | | | Volume/Number: | 2007 December 18 | | | | Issuing Agency: | | | | | Description: | 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. | | | | Date Created: | 12 2007 | | | | Agency ID: | AQPSTR 07-04 | | | | ISL ID: | 000000012648 Original UID: 6619 FIRST WORD: Technical | |
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