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 8/19  8/20  8/21  8/22  8/23  8/24  8/25 
Chicago Metropolitan  Cook Alsip 54/45  41/36  31/28  39/35  47/44  43/35  60/47 
Cook Chicago - ComEd 53/42  41/35  30/27  41/35  45/43  42/31  57/42 
Cook Chicago - SWFP 50/44  42/36  30/28  44/39  46/44  44/34  53/50 
Cook Chicago - Taft 63/49  39/33  30/26  52/43  50/47  43/30  58/49 
Cook Cicero 57/43  39/33  29/27  47/40  45/43  40/31  60/44 
Cook Des Plaines 65/49  41/34  28/26  49/43  55/49  41/32  49/42 
Cook Evanston 58/45  39/33  28/25  50/41  49/43  40/32  52/46 
Cook Lemont 57/48  42/35  30/27  44/38  48/45  43/39  52/44 
Cook Northbrook 67/51  42/34  29/26  51/45  58/51  41/32  52/46 
Cook Schiller Park 57/41  --/--  --/--  --/--  --/--  --/--  --/-- 
DuPage Lisle 64/50  41/34  30/27  41/38  48/45  39/35  49/44 
Kane Elgin 57/51  39/31  29/26  35/34  50/46  36/30  47/42 
Lake Zion 59/49  38/32  30/24  58/48  59/51  37/28  49/41 
McHenry Cary 55/47  39/31  29/25  37/34  50/46  37/31  44/42 
Will Braidwood 48/38  39/34  28/25  32/30  47/43  48/41  40/37 
Metro East  Jersey Jerseyville 52/40  39/37  32/28  60/49  37/30  41/34  47/42 
Madison Alton 44/35  39/37  32/28  48/44  32/29  42/36  57/52 
Madison Maryville 36/30  44/41  32/30  48/40  35/32  43/36  61/52 
Madison Wood River 41/32  41/39  33/29  49/45  34/31  46/38  61/54 
Randolph Houston 26/23  41/37  32/28  39/35  29/25  24/20  44/38 
St. Clair East St. Louis 33/28  42/39  31/28  44/38  31/25  32/27  44/41 
Northern Illinois  Rock Island Rock Island 42/33  35/30  29/26  33/31  43/39  57/47  39/34 
Winnebago Loves Park 45/39  39/31  29/26  34/32  52/46  41/38  38/35 
West Central Illinois  Adams Quincy 29/25  38/30  29/26  37/35  36/31  39/35  37/34 
Macoupin Nilwood 36/29  35/32  27/24  35/32  37/34  34/29  39/38 
Peoria Peoria 52/35  39/34  32/28  34/32  42/38  51/44  33/31 
Peoria Peoria Heights 49/36  38/33  32/28  36/34  45/42  49/43  36/33 
Sangamon Springfield 33/28  37/34  27/24  38/36  42/39  35/32  44/41 
East Central Illinois  Champaign Thomasboro 37/32  38/34  24/22  41/35  47/42  36/32  43/40 
McLean Normal 44/35  39/36  31/27  36/34  48/42  47/38  45/39 
Macon Decatur 30/28  40/37  28/26  36/32  40/36  34/32  44/42 
Southeast Illinois  Effingham Effingham 30/26  44/38  27/25  32/30  41/37  33/28  44/39 
Hamilton Knight Prairie Township 35/28  32/16  --/--  --/--  --/--  --/--  --/--