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 3/22  3/23  3/24  3/25  3/26  3/27  3/28 
Chicago Metropolitan  Cook Alsip 47/45  41/38  59/52  30/22  37/30  26/23  39/36 
Cook Chicago - ComEd 45/43  39/36  56/50  28/20  36/28  22/20  36/31 
Cook Chicago - SWFP 50/48  41/37  57/50  36/32  34/30  33/33  38/37 
Cook Chicago - Taft 45/41  34/31  49/42  32/27  32/24  24/28  35/32 
Cook Cicero 49/44  39/36  --/--  --/--  --/--  --/--  33/30 
Cook Des Plaines 45/44  39/36  53/45  33/28  35/26  27/29  37/35 
Cook Evanston 49/47  42/36  56/47  36/32  32/27  28/32  40/36 
Cook Lemont 45/42  42/39  59/51  31/24  36/30  21/24  40/37 
Cook Northbrook 49/47  --/--  --/--  37/33  32/26  29/33  40/38 
Cook Schiller Park 42/38  35/32  47/40  32/27  33/23  23/27  35/33 
DuPage Lisle 42/41  40/37  54/47  30/26  38/28  20/23  41/37 
Kane Elgin 46/45  41/38  53/48  30/28  34/21  24/23  41/36 
Lake Zion 46/45  45/38  51/40  33/29  27/24  26/29  35/34 
McHenry Cary 46/44  39/34  53/46  30/27  30/22  23/24  40/36 
Will Braidwood 42/39  39/35  55/49  23/22  31/27  22/17  33/32 
Metro East  Jersey Jerseyville 46/44  40/36  52/49  51/49  34/29  34/28  40/35 
Madison Alton --/--  --/--  51/47  49/47  31/24  27/24  41/38 
Madison Maryville 48/45  45/40  54/51  53/52  29/21  29/25  47/43 
Madison Wood River 44/42  42/37  49/45  51/49  31/23  27/24  43/39 
Randolph Houston 51/47  48/42  51/50  57/54  33/29  35/32  47/43 
St. Clair East St. Louis 39/36  33/29  41/38  39/37  22/16  18/16  33/29 
Northern Illinois  Rock Island Rock Island 46/44  37/35  52/47  25/24  16/14  19/16  39/33 
Winnebago Loves Park 49/46  38/36  53/45  30/27  21/19  25/22  45/42 
West Central Illinois  Adams Quincy 49/47  43/41  51/47  56/50  32/26  29/24  32/29 
Macoupin Nilwood 46/43  39/34  52/48  49/47  31/25  26/23  37/35 
Peoria Peoria 48/46  39/34  57/51  51/46  35/30  21/18  38/36 
Peoria Peoria Heights 49/47  41/35  58/52  54/47  38/31  19/16  38/38 
Sangamon Springfield 43/43  39/35  55/51  49/45  32/26  27/22  38/32 
East Central Illinois  Champaign Thomasboro 46/43  39/36  52/49  50/43  34/29  30/26  39/35 
McLean Normal 44/43  34/30  54/50  50/44  32/27  26/21  35/31 
Macon Decatur 49/45  40/36  47/44  49/46  37/27  34/26  41/37 
Southeast Illinois  Effingham Effingham 46/42  38/33  47/45  50/47  36/29  33/26  42/39 
Hamilton Knight Prairie Township 48/46  44/38  48/46  57/52  40/34  56/52  43/38