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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 10/15  10/16  10/17  10/18  10/19  10/20  10/21 
Chicago Metropolitan  Cook Alsip 30/22  25/15  29/20  23/19  33/30  31/23  35/30 
Cook Chicago - ComEd 25/17  20/12  23/18  20/17  30/26  26/19  32/28 
Cook Chicago - SWFP 33/27  28/15  22/16  21/18  24/21  25/22  32/31 
Cook Chicago - Taft 30/23  22/15  26/21  23/20  29/25  31/24  32/29 
Cook Cicero 25/18  19/12  24/17  21/15  25/20  25/19  27/25 
Cook Des Plaines 27/17  17/10  23/18  21/18  26/22  29/22  30/24 
Cook Evanston 31/25  25/15  26/22  24/21  27/24  29/24  34/33 
Cook Lemont 22/16  17/13  22/14  19/15  26/23  32/25  24/20 
Cook Northbrook 29/23  21/14  24/21  24/20  29/25  27/23  32/30 
Cook Schiller Park 29/20  22/14  23/23  --/--  --/--  --/--  29/23 
DuPage Lisle 22/18  17/12  20/15  22/16  24/22  31/28  27/22 
Kane Elgin 22/18  17/11  22/17  24/19  26/23  31/27  23/20 
Lake Zion 30/24  19/16  26/22  24/20  29/27  28/23  35/32 
McHenry Cary 24/20  18/14  24/20  24/21  27/24  32/28  25/23 
Will Braidwood 21/19  24/18  22/21  24/20  30/28  38/34  31/26 
Metro East  Jersey Jerseyville 21/19  38/31  29/27  23/21  32/24  37/34  36/31 
Madison Alton 24/22  38/30  33/30  28/26  34/26  44/39  41/37 
Madison Maryville 22/19  39/31  33/31  28/25  26/26  45/38  40/35 
Madison Wood River 23/20  29/22  30/26  27/23  29/23  41/34  39/34 
Randolph Houston 32/27  44/40  45/41  36/33  40/36  53/47  50/44 
St. Clair East St. Louis 20/17  35/26  31/28  27/23  30/24  40/34  39/32 
Northern Illinois  Rock Island Rock Island 28/26  38/31  25/21  23/19  34/31  37/34  30/26 
Winnebago Loves Park 26/21  --/--  --/--  --/--  --/--  --/--  --/-- 
West Central Illinois  Adams Quincy 31/27  40/35  32/30  25/23  34/29  37/34  37/33 
Macoupin Nilwood 22/20  28/28  30/28  23/20  27/24  39/36  35/31 
Peoria Peoria 20/17  29/20  24/22  20/15  32/28  36/31  28/24 
Peoria Peoria Heights 22/20  33/24  25/23  25/19  35/31  37/34  30/27 
Sangamon Springfield 21/19  33/28  30/28  17/15  31/26  37/34  31/28 
East Central Illinois  Champaign Thomasboro 16/15  20/17  --/--  --/--  --/--  --/--  --/-- 
McLean Normal 21/19  27/21  27/24  27/19  32/29  38/33  32/27 
Macon Decatur 22/20  30/26  33/30  23/21  38/32  43/38  37/32 
Southeast Illinois  Effingham Effingham 20/18  26/22  34/31  25/22  29/25  43/38  33/29 
Hamilton Knight Prairie Township 23/22  39/33  49/44  34/31  39/33  53/48  46/41 

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