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 70 parts per billion;
Region  County Site 10/25  10/26  10/27  10/28  10/29  10/30  10/31 
Chicago Metropolitan  Cook Alsip 26/23  19/16  25/22  32/30  45/38  23/21  34/33 
Cook Chicago - ComEd 23/20  18/16  27/22  31/29  39/34  21/19  20/21 
Cook Chicago - SWFP 35/27  29/25  29/29  28/28  39/33  30/27  32/20 
Cook Chicago - Taft 29/27  25/19  33/29  33/31  33/30  24/23  23/24 
Cook Cicero 21/18  16/13  25/21  26/27  32/27  21/17  15/15 
Cook Des Plaines 31/30  26/23  30/26  31/30  32/30  23/21  22/18 
Cook Evanston 35/33  31/29  30/28  33/31  33/31  29/29  32/23 
Cook Lemont 26/24  23/21  29/25  35/33  48/42  26/21  24/23 
Cook Northbrook 32/29  26/24  31/27  30/29  32/29  21/19  20/18 
Cook Schiller Park 23/18  18/15  23/17  28/26  28/23  21/19  17/15 
DuPage Lisle 25/21  16/15  28/26  31/29  39/32  22/20  21/20 
Kane Elgin 21/16  17/17  21/21  27/26  34/30  21/19  20/19 
Lake Zion 36/33  35/30  31/28  32/31  34/30  22/20  24/21 
McHenry Cary 29/26  25/20  30/27  32/29  31/29  20/18  20/21 
Will Braidwood 29/27  24/19  28/26  35/32  51/46  23/22  30/26 
Metro East  Jersey Jerseyville 39/36  40/33  32/28  40/37  50/46  34/31  29/26 
Madison Alton 37/33  29/21  25/22  40/32  44/40  31/22  28/23 
Madison Maryville 44/37  47/37  27/23  47/40  48/44  39/35  36/33 
Madison Wood River 41/35  31/21  27/23  43/34  48/41  34/24  30/25 
Randolph Houston 44/39  53/45  24/22  47/43  48/45  54/43  38/34 
St. Clair East St. Louis 39/34  41/27  19/17  46/36  43/40  38/27  30/21 
Northern Illinois  Rock Island Rock Island 27/24  23/18  23/19  34/34  50/43  24/20  30/28 
Winnebago Loves Park 24/18  22/20  29/27  35/32  35/29  20/17  21/20 
West Central Illinois  Adams Quincy 36/33  33/31  31/28  46/43  45/43  34/21  31/32 
Macoupin Nilwood 37/33  36/29  23/19  37/32  48/42  24/21  31/24 
Peoria Peoria 28/25  23/20  23/20  34/30  48/41  --/--  --/-- 
Peoria Peoria Heights 30/28  28/23  23/21  33/31  48/44  23/19  31/27 
Sangamon Springfield 36/33  36/28  24/20  36/34  48/44  33/28  32/27 
East Central Illinois  Champaign Thomasboro 27/23  38/32  19/17  34/31  46/43  25/22  25/20 
McLean Normal 29/26  31/24  23/20  35/34  48/41  25/20  28/26 
Macon Decatur 37/32  36/30  23/19  36/35  52/47  29/25  30/25 
Southeast Illinois  Effingham Effingham 41/36  53/41  22/18  37/30  50/46  38/30  28/25 
Hamilton Knight Prairie Township 45/37  59/51  38/24  42/37  49/47  53/49  40/33