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Air Quality Information

Illinois Ozone Highs

1-Hr/8-Hr High Concentrations

(Values in Parts Per Billion)
First number in each column is 1-hour concentration - Standard of 125 parts per billion
Second number in each column is 8-hour concentration. - Standard of 75 parts per billion;

Region  County Site 10/17  10/18  10/19  10/20  10/21  10/22  10/23 
Chicago Metropolitan  Cook Alsip 29/20  23/19  33/30  31/23  35/30  33/30  33/28 
Cook Chicago - ComEd 23/18  20/17  30/26  26/19  32/28  33/27  35/29 
Cook Chicago - SWFP 22/16  21/18  24/21  25/22  32/31  36/34  27/22 
Cook Chicago - Taft 26/21  23/20  29/25  31/24  32/29  33/28  29/26 
Cook Cicero 24/17  21/15  25/20  25/19  27/25  26/21  29/24 
Cook Des Plaines 23/18  21/18  26/22  29/22  30/24  32/29  25/20 
Cook Evanston 26/22  24/21  27/24  29/24  34/33  38/28  30/23 
Cook Lemont 22/14  19/15  26/23  32/25  24/20  26/22  33/31 
Cook Northbrook 24/21  24/20  29/25  27/23  32/30  34/31  30/24 
Cook Schiller Park 23/23  --/--  --/--  --/--  29/23  24/24  26/21 
DuPage Lisle 20/15  22/16  24/22  31/28  27/22  24/18  28/22 
Kane Elgin 22/17  24/19  26/23  31/27  23/20  26/18  31/25 
Lake Zion 26/22  24/20  29/27  28/23  35/32  37/36  33/27 
McHenry Cary 24/20  24/21  27/24  32/28  25/23  26/21  30/26 
Will Braidwood 22/21  24/20  30/28  38/34  31/26  38/33  35/31 
Metro East  Jersey Jerseyville 29/27  23/21  32/24  37/34  36/31  34/27  30/23 
Madison Alton 33/30  28/26  34/26  44/39  41/37  37/33  31/24 
Madison Maryville 33/31  28/25  26/26  45/38  40/35  38/30  35/31 
Madison Wood River 30/26  27/23  29/23  41/34  39/34  33/28  29/23 
Randolph Houston 45/41  36/33  40/36  53/47  50/44  44/36  44/39 
St. Clair East St. Louis 31/28  27/23  30/24  40/34  39/32  33/26  28/25 
Northern Illinois  Rock Island Rock Island 25/21  23/19  34/31  37/34  30/26  33/30  29/26 
Winnebago Loves Park --/--  --/--  --/--  --/--  --/--  --/--  30/26 
West Central Illinois  Adams Quincy 32/30  25/23  34/29  37/34  37/33  37/33  28/25 
Macoupin Nilwood 30/28  23/20  27/24  39/36  35/31  38/32  37/30 
Peoria Peoria 24/22  20/15  32/28  36/31  28/24  37/31  26/23 
Peoria Peoria Heights 25/23  25/19  35/31  37/34  30/27  40/35  30/25 
Sangamon Springfield 30/28  17/15  31/26  37/34  31/28  43/33  32/27 
East Central Illinois  Champaign Thomasboro --/--  --/--  --/--  --/--  --/--  --/--  --/-- 
McLean Normal 27/24  27/19  32/29  38/33  32/27  40/35  34/34 
Macon Decatur 33/30  23/21  38/32  43/38  37/32  44/38  35/31 
Southeast Illinois  Effingham Effingham 34/31  25/22  29/25  43/38  33/29  36/32  37/30 
Hamilton Knight Prairie Township 49/44  34/31  39/33  53/48  46/41  42/36  38/33 

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