|  | | 1: |  | Title:   |  |  |  |  | Volume/Number: | 2009 |  |  |  | Issuing Agency: |  |  |  |  | Description: | This document describes Illinois Maintenance Plan for the Illinois portion of the Chicago ozone nonattainment area. A Maintenance Plan is required before the area can be redesignated from nonattainment to attainment of the 8-hour ozone National Ambient Air Quality Standard (NAAQS) promulgated in 1997. This document also provides technical information required to support a redesignation request. |  |  |  | Date Created: | 05-12-2009 |  |  |  | Agency ID: | AQPSTR 09-04 |  |  |  | ISL ID: | 000000056836   Original UID: 177798 FIRST WORD: Maintenance |  | 
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