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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 9/12  9/13  9/14  9/15  9/16  9/17  9/18 
Chicago Metropolitan  Cook Alsip 25/17  32/27  48/43  32/23  43/36  52/48  58/49 
Cook Chicago - ComEd 26/16  29/25  47/43  30/23  43/32  47/44  54/46 
Cook Chicago - SWFP 30/26  31/28  42/38  38/26  35/32  49/44  51/43 
Cook Chicago - Taft 21/19  31/26  45/41  34/24  44/36  46/41  45/41 
Cook Cicero 19/16  27/23  43/38  29/22  42/32  47/39  46/40 
Cook Des Plaines 18/13  28/24  40/38  28/18  40/35  47/41  41/36 
Cook Evanston 29/24  33/31  43/38  37/27  43/40  51/47  48/40 
Cook Lemont 16/13  23/20  39/36  31/19  41/35  49/41  47/36 
Cook Northbrook 20/17  31/26  42/39  32/25  41/37  43/37  40/36 
Cook Schiller Park 18/16  20/17  --/--  --/--  36/30  40/35  40/36 
DuPage Lisle 18/15  24/21  37/35  26/20  40/34  48/41  43/35 
Kane Elgin 19/16  28/24  38/35  24/19  41/36  44/40  42/36 
Lake Zion 20/17  32/27  41/38  33/26  43/38  49/42  40/33 
McHenry Cary 18/16  28/24  38/35  27/23  43/37  46/41  37/33 
Will Braidwood 19/16  32/28  41/37  29/24  45/38  47/43  53/49 
Metro East  Jersey Jerseyville 18/17  32/29  47/42  27/32  31/27  29/24  49/44 
Madison Alton 24/21  38/35  52/48  29/34  33/31  34/31  50/46 
Madison Maryville 22/20  38/34  53/45  34/30  35/31  29/19  --/-- 
Madison Wood River 22/17  37/33  55/46  26/27  32/28  31/29  46/42 
Randolph Houston 29/26  40/37  48/45  43/38  42/40  47/38  60/53 
St. Clair East St. Louis 20/18  37/33  52/43  33/28  31/26  33/27  50/44 
Northern Illinois  Rock Island Rock Island 18/20  39/34  40/36  38/29  40/35  46/38  55/52 
Winnebago Loves Park 18/16  36/32  38/35  30/26  38/34  42/38  43/37 
West Central Illinois  Adams Quincy 22/19  35/32  42/37  32/29  38/35  32/29  47/44 
Macoupin Nilwood 20/19  37/34  40/38  30/25  36/32  31/28  48/45 
Peoria Peoria 20/19  37/32  39/34  23/21  40/35  40/35  48/45 
Peoria Peoria Heights --/--  --/--  --/--  23/22  41/36  44/39  52/49 
Sangamon Springfield 19/19  35/32  44/40  27/24  37/34  38/35  54/47 
East Central Illinois  Champaign Thomasboro 22/19  36/32  46/41  29/24  41/36  50/44  50/47 
McLean Normal 19/19  38/35  46/43  32/28  43/38  45/41  53/50 
Macon Decatur 23/21  38/35  47/43  34/26  43/39  46/46  59/53 
Southeast Illinois  Effingham Effingham 28/25  38/32  40/38  33/30  39/31  39/31  51/47 
Hamilton Knight Prairie Township 27/25  35/32  44/40  45/41  35/31  48/41  55/50 

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