SIP Status Reports
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Status of Illinois Designated Areas
Status of Illinois Designated Areas
Illinois Areas by NAAQSNOTE: As of 03/12/2021, these reports are no longer being updated. For the latest information, see the SIP Status Tools.
Jump to Illinois section for: CO (1971) Lead (1978) Lead (2008) NO2 (1971) Ozone-1Hr (1979) Ozone-8Hr (1997) Ozone-8Hr (2008) Ozone-8Hr (2015) PM-10 (1987) PM-2.5 (1997) PM-2.5 (2006) PM-2.5 (2012) SO2 (1971) SO2 (2010)
Illinois CO (1971) Areas Return to map |
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| No designated areas for this pollutant. | |||||||||||
Illinois Lead (1978) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
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Illinois Lead (2008) Areas Return to map Top of page |
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| Click on the Area name to view SIP Required Elements Area |
Status | Designation Date |
Classification | 2010 Population (state portion) |
Meets NAAQS Basis |
Design Value Annual (µg/m3) (entire area) |
Meets NAAQS |
SIP Requirements Original/ Approved |
Clean Air Determination Citation Effective Date Click to view FR notice |
Redesignation Request Date |
Redesignation Citation Effective Date Click to view FR notice |
| Chicago | Maintenance | 12/31/2011 | 35,696 | 2017-2019 | 0.01 | Yes | 6 / 1 | 10/23/2015 80 FR 51127 |
09/22/2016 | 03/28/2018 83 FR 13198 |
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| Granite City | Maintenance | 12/31/2010 | 38,901 | 2017-2019 | 0.15 | Yes | 6 / 1 | 03/28/2018 83 FR 13198 |
09/22/2016 | 03/28/2018 83 FR 13198 |
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Illinois NO2 (1971) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
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Illinois Ozone-1Hr (1979) Areas Return to map Top of page |
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| Click on the Area name to view SIP Required Elements Area |
Status | Designation Date |
Classification | 2010 Population (state portion) |
Meets NAAQS Basis |
Design Value Annual (ppm) (entire area) |
Meets NAAQS |
SIP Requirements Original/ Approved |
Clean Air Determination Citation Effective Date Click to view FR notice |
Redesignation Request Date |
Redesignation Citation Effective Date Click to view FR notice |
| Chicago-Gary-Lake County Area | Nonattainment (NAAQS revoked) | 11/15/1990 | Severe-17 | 8,361,740 | 2017-2019 | 0.100 | Yes | 30 / 29 | 01/29/2009 73 FR 79652 |
01/30/2007 | |
| Jersey County Area | Maintenance (NAAQS revoked) | 01/06/1992 | Marginal | 22,985 | 2017-2019 | 0.087 | Yes | 4 / 4 | |
11/12/1993 | 04/13/1995 60 FR 13634 |
| St. Louis Area | Maintenance (NAAQS revoked) | 11/15/1990 | Serious | 572,295 | 2017-2019 | 0.098 | Yes | 27 / 21 | |
12/30/2002 | 05/12/2003 68 FR 25442 |
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Illinois Ozone-8Hr (1997) Areas Return to map Top of page |
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| Click on the Area name to view SIP Required Elements Area |
Status | Designation Date |
Classification | 2010 Population (state portion) |
Meets NAAQS Basis |
Design Value Annual (ppm) (entire area) |
Meets NAAQS |
SIP Requirements Original/ Approved |
Clean Air Determination Citation Effective Date Click to view FR notice |
Redesignation Request Date |
Redesignation Citation Effective Date Click to view FR notice |
| Chicago-Gary-Lake County Area | Maintenance (NAAQS revoked) | 06/15/2004 | Subpart 2/Moderate | 8,389,546 | 2017-2019 | 0.075 | Yes | 53 / 49 | 04/12/2010 75 FR 12088 |
07/23/2009 | 08/13/2012 77 FR 48062 |
| St. Louis Area | Maintenance (NAAQS revoked) | 06/15/2004 | Subpart 2/Moderate | 595,280 | 2017-2019 | 0.071 | Yes | 53 / 49 | 07/11/2011 76 FR 33647 |
05/26/2010 | 06/12/2012 77 FR 34819 |
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Illinois Ozone-8Hr (2008) Areas Return to map Top of page |
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| Click on the Area name to view SIP Required Elements Area |
Status | Designation Date |
Classification | 2010 Population (state portion) |
Meets NAAQS Basis |
Design Value Annual (ppm) (entire area) |
Meets NAAQS |
SIP Requirements Original/ Approved |
Clean Air Determination Citation Effective Date Click to view FR notice |
Redesignation Request Date |
Redesignation Citation Effective Date Click to view FR notice |
| Chicago-Naperville | Nonattainment | 07/20/2012 | Serious | 8,389,546 | 2017-2019 | 0.075 | Yes | 59 / 5 | |
05/06/2020 | |
| St. Louis-St. Charles-Farmington | Maintenance | 07/20/2012 | Marginal | 572,295 | 2017-2019 | 0.071 | Yes | 3 / 2 | 08/26/2016 81 FR 41444 |
05/08/2017 | 03/01/2018 83 FR 8756 |
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Illinois Ozone-8Hr (2015) Areas Return to map Top of page |
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| Click on the Area name to view SIP Required Elements Area |
Status | Designation Date |
Classification | 2010 Population (state portion) |
Meets NAAQS Basis |
Design Value Annual (ppm) (entire area) |
Meets NAAQS |
SIP Requirements Original/ Approved |
Clean Air Determination Citation Effective Date Click to view FR notice |
Redesignation Request Date |
Redesignation Citation Effective Date Click to view FR notice |
| Chicago | Nonattainment | 08/03/2018 | Marginal | 8,076,475 | 2017-2019 | 0.075 | No | 3 / 1 | |
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| St. Louis | Nonattainment | 08/03/2018 | Marginal | 539,338 | 2017-2019 | 0.071 | No | 3 / 1 | |
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Illinois PM-10 (1987) Areas Return to map Top of page |
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| Click on the Area name to view SIP Required Elements Area |
Status | Designation Date |
Classification | 2010 Population (state portion) |
Meets NAAQS Basis |
Average Estimated Exceedances (est. exc.) (entire area) |
Meets NAAQS |
SIP Requirements Original/ Approved |
Clean Air Determination Citation Effective Date Click to view FR notice |
Redesignation Request Date |
Redesignation Citation Effective Date Click to view FR notice |
| Cook County; Lyons Township | Maintenance | 11/15/1990 | Moderate | 111,688 | 2017-2019 | Insufficient Data | 3 / 3 | |
08/02/2005 | 11/21/2005 70 FR 55541 |
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| Cook County; Southeast Chicago (see 40 CFR 81.314, PM-10 table, Cook County entry b. for description) | Maintenance | 11/15/1990 | Moderate | 3,117 | 2017-2019 | Insufficient Data | 3 / 3 | |
08/02/2005 | 11/21/2005 70 FR 55545 |
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| LaSalle County; Oglesby | Maintenance | 11/15/1990 | Moderate | 3,862 | 2017-2019 | No Data | 3 / 3 | |
01/09/1996 | 10/07/1996 61 FR 41342 |
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| Madison County; Granite City Township and Nameoki Township | Maintenance | 11/15/1990 | Moderate | 35,652 | 2017-2019 | 0.0 | Yes | 3 / 3 | |
03/20/1996 | 05/11/1998 63 FR 11842 |
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Illinois PM-2.5 (1997) Areas Return to map Top of page |
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| Click on the Area name to view SIP Required Elements Area |
Status | Designation Date |
Classification | 2010 Population (state portion) |
Meets NAAQS Basis |
Design Value Annual (µg/m3) (entire area) |
Meets NAAQS |
SIP Requirements Original/ Approved |
Clean Air Determination Citation Effective Date Click to view FR notice |
Redesignation Request Date |
Redesignation Citation Effective Date Click to view FR notice |
| Chicago-Gary-Lake County | Maintenance (NAAQS revoked) | 04/05/2005 | Former Subpart 1 | 8,389,546 | 2017-2019 | 10.8 | Yes | 5 / 1 | 10/02/2013 78 FR 60704 |
10/15/2010 | 10/02/2013 78 FR 60704 |
| St. Louis | Maintenance (NAAQS revoked) | 04/05/2005 | Moderate | 573,748 | 2017-2019 | 10.3 | Yes | 8 / 1 | 07/27/2012 77 FR 38183 |
12/06/2018 | 05/28/2019 84 FR 24395 |
Illinois PM-2.5 (2006) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
Illinois PM-2.5 (2012) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
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Illinois SO2 (1971) Areas Return to map Top of page |
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| Click on the Area name to view SIP Required Elements Area |
Status | Designation Date |
Classification | 2010 Population (state portion) |
Meets NAAQS Basis |
Design Value Annual/24-Hr (ppb) (entire area) |
Meets NAAQS |
SIP Requirements Original/ Approved |
Clean Air Determination Citation Effective Date Click to view FR notice |
Redesignation Request Date |
Redesignation Citation Effective Date Click to view FR notice |
| Peoria County: Hollis twp | Maintenance | 03/03/1978 | 2,032 | / | 0 / 0 | |
11/10/1994 | 06/05/1995 60 FR 16996 |
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| Peoria County: Peoria | Maintenance | 03/03/1978 | 127,507 | / | 0 / 0 | |
11/10/1994 | 06/05/1995 60 FR 16996 |
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| Tazewell County: Groveland twp | Maintenance | 03/03/1978 | 22,991 | / | 0 / 0 | |
11/10/1994 | 06/05/1995 60 FR 16996 |
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Illinois SO2 (2010) Areas Return to map Top of page |
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| Click on the Area name to view SIP Required Elements Area |
Status | Designation Date |
Classification | 2010 Population (state portion) |
Meets NAAQS Basis |
3 Year 1-Hour Design Value (ppb) (entire area) |
Meets NAAQS |
SIP Requirements Original/ Approved |
Clean Air Determination Citation Effective Date Click to view FR notice |
Redesignation Request Date |
Redesignation Citation Effective Date Click to view FR notice |
| Alton Township | Nonattainment | 09/12/2016 | 0 | 2017-2019 | No Data | 6 / 0 | |
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| Lemont | Maintenance | 10/04/2013 | 168,916 | 2017-2019 | 6 | Yes | 6 / 5 | 05/26/2020 85 FR 31378 |
05/30/2019 | 05/26/2020 85 FR 31378 |
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| Pekin | Maintenance | 10/04/2013 | 41,194 | 2017-2019 | Insufficient Data | 6 / 5 | 05/26/2020 85 FR 31378 |
05/30/2019 | 05/26/2020 85 FR 31378 |
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| We have made our best effort to ensure that the data contained in these reports is accurate. We note that there may be brief delays in
updating the reports as we receive new state submissions and we take rulemaking action on plans. In order to assist us in providing
accurate information, we request that you contact us by clicking on the "Contact Us" link near the top of this page with any comments
regarding or corrections to the posted information, including concerns about whether the entries reflect the most recent status. Current and historical design value data can be found on the EPA Air Quality Design Values website and the EPA Green Book contains comprehensive nonattainment area, designation status, and historical information. The level of the 1-hour NAAQS for sulfur dioxide is 75 parts per billion (ppb) calculated as the 3-year average of the 99th percentile of the annual distribution of daily maximum 1-hour average concentrations. |