### IlliNOIS ENVIRONMENTAL PROTECTION AGENCY 1021 North Grand Avenue East, P.O. Box 19276, Springfield, Illinois 62794-9276**~** {217) 782-2829 Jarnes R. Thompson Center, 100 Wesl Randolph, Suite 11-300, Chicago, JL 60601 0 {J12) 814-6026 217/782-7326 217/782-9143 (TDD) October 15, 2010 PAT QUINN, GOVERNOR

Dr. Susan Hedman, Regional Administrator Office ofthe Regional Administrator, R-19J U. S. Environmental Protection Agency, Region 5 77 West Jackson Boulevard Chicago, Illinois 60604-3507 Re: PM2.5 Redesignation Request for Chicago Dear Dr. Hedman: DOUGLAS P. ScoTT, DIRECTOR



## OCT 

## 25

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The Illinois Environmental ProtectionAgency (Illinois EPA), onbehalfofthe State ofIllinois, hereby requests that the Illinois portion ofthe Chicago PM25 nonattainment area (NAA) be redesignated to attainment ofthe PM2

### .s National Ambient Air Quality Staodard (NAAQS) promulgated in 1997. The Chicago portion ofthe 

### PM 25 NAA consists ofCook, DuPage, Kane, Lake, McHenry and Will counties, as well as Aux Sable and Goose LakeTownships in Gnmdy County and Oswego Township inKendall County. The Illinois EPA understands that the State of Indiana has already submitted a similarredesignation request for the Indianaportion ofthe NAA. Ambient air monitoring data collected by the Illinois EPA in the Chicago area from 2007 through 2009, as well as data collected in Indiana during the same 3-yearperiod, demonstrates that the entire Chicago NAA is currently meeting the 1997 PM2.5 NAAQS. In fact, in November 2009, the United States Environmental Protection Agency published its determination that the entire Chicago NAA attains the 1997 PM2.5NAAQS. In addition to demonstrating that air quality in the Chicago NAA attains the NAAQS, the Chicago area has met all ofthe relevant requirements under Section 107, Section II0, and Part D ofthe Clean Air Act (CAA). The Illinois EPA**}H;r,~by** submits a Maintenance Plan for the Chicago PM2.5 nonattainment area pursuant to Sections 107(d)(3)(E), 110(a)(2), and 175A ofthe CAA. Also included are attainment year 2008 and Maintenance Plan year 2025 motor vehicle emissions budgets developed using the MOBILE6 model. The Maintenance Plan SIP submittal and the motor vehicle emissions budgets are required as part ofthe Illinois EPA's redesignation request The Maintenance Plan provides the supporting information for this request, consistent with the criteria for redesig1mtion set forth in Section 175A ofthe CAA. The Maintenance Plan constitutes a revision ofthe Illinois' State Implementation Plan (SIP) for PM25 . Accordingly, the Illinois EPA held a public hearing in Chicago on July 14, 2010, to accept comments on the draft Maintenance Plan. Comments were accepted for an additional30 days after the hearing. The Illinois EPA's responses to comments received are included with this submittaL

Rockford "' 410: 1 )\1. Main St., Rockford, I L611 03 '" (8 JS) 987·77h0 Elgin" 595 5. Stale, Elgin, II_ 60123 "{IJ47) 603-3131 Bureau of land-**Peoria~** 7620 N. University St., Peoria, IL 61614" (309)**693-5~62** Collinsville,. 2009 Mall Street, Collinsville, IL 62234 0 (61 8) 346-5120 1 Des**!"lai111~o"** 9511 W. !Iarrison St., Des Pli!ines, ll 60016 "{847) 294-4000 Peoria"' 5415 N.**Univ~rsity** St., Peoria, IL 61614" {:!09) 693-5463 Ch;unpaign o 2125 S. fir;;! St., Champaign, IL h Hl20 e (217) 273
..5300 lvhrion**~** 1J09_w. Main St., Suite 116, M;,rion, IL 62959**~** (6 113) 993-7200 Prinitd on Rcr'ycb:l Pa[lCIIn order to assist with your review ofthe Chicago Maintenance Plan SIP submittal, the Illinois EPA has included the following documents: Attachment 1)

Attachment 

### 2) Attachment 3) Attachment 4) Attachment 5)

Attachment 6) Draft Maintenance Plan for the Chicago Nonattainment Area for the 1997 PM25 National Ambient Air Quality Standards, AQPSTR 10-05, Illinois EPA, June 1,2010. Notice ofPublic Hearing, June 11, 2010. Public Hearing Sign-in Sheet. Transcript ofPublic Hearing held on July 14, 2010. Responsiveness Summary for Comments Received from the Public Hearing for the Draft Maintenance Plan related to the 1997 PM2.s National Ambient Air Quality Standards (NAAQS) and its Associated Draft Motor Vehicle Emissions Budgets for the Chicago Nonattainment Area. Final Maintenance Plan for the Chicago Nonattainment Area for the 1997 PM2.5 NationalAmbient Air Quality Standards, AQPSTR 10-05, lllinois EPA, September 7, 2010. Illinois EPA believes that this submittal will allow the U.S. EPA to expeditiously take the necessary actions to redesignate the Chicago area to attainment for the 1997 PM2.s NAAQS. If further information is required or should you have any questions, please feel free to contact Laurel L. Kroack, Chiefofthe Bureau ofAir. Very truly yours,



# JL'!RiJcJ£1- Douglas'P. Scott Director Attachments
cc: Cheryl L. Newton, U.S. EPA Region 5

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