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 8/21  8/22  8/23  8/24  8/25  8/26  8/27 
Chicago Metropolitan  Cook Alsip 50/48  61/56  45/37  39/37  45/39  27/22  39/29 
Cook Chicago - ComEd 49/47  61/55  43/36  35/34  41/36  27/23  35/30 
Cook Chicago - SWFP 50/46  56/51  39/33  36/35  --/--  --/--  --/-- 
Cook Chicago - Taft 55/49  57/55  43/35  37/35  40/34  23/19  45/39 
Cook Cicero 50/45  55/52  42/32  38/36  41/32  25/20  38/34 
Cook Des Plaines 57/49  58/56  45/35  35/33  38/35  23/20  46/41 
Cook Evanston 54/48  56/52  37/32  37/35  37/33  32/29  46/41 
Cook Lemont 55/50  62/56  48/36  41/38  46/39  30/25  52/46 
Cook Northbrook 59/52  59/57  42/35  39/36  40/34  26/22  47/43 
Cook Schiller Park 47/40  53/51  43/32  32/30  33/28  25/16  33/29 
DuPage Lisle 51/47  62/55  45/34  39/36  41/35  28/24  53/45 
Kane Elgin 52/49  58/53  41/32  39/36  41/35  28/26  50/43 
Lake Zion 56/45  56/51  32/29  36/33  31/28  26/24  43/40 
McHenry Cary 50/48  54/50  39/31  37/34  36/33  29/26  46/38 
Will Braidwood 47/44  60/53  35/30  36/33  40/37  28/24  41/38 
Metro East  Jersey Jerseyville 57/51  39/36  33/29  38/36  44/41  43/41  42/39 
Madison Alton 58/51  43/38  32/29  40/38  46/43  44/42  46/43 
Madison Maryville 48/42  35/30  27/24  33/31  39/37  40/37  50/41 
Madison Wood River 54/48  41/38  31/27  36/34  43/41  43/40  45/41 
Randolph Houston --/--  49/42  42/28  46/41  52/47  45/43  49/41 
St. Clair East St. Louis 53/47  37/30  32/29  41/38  45/42  47/43  57/49 
Northern Illinois  Rock Island Rock Island 46/44  51/49  29/25  34/32  39/36  38/36  41/39 
Winnebago Loves Park 51/48  56/51  40/30  39/36  35/33  36/32  43/40 
West Central Illinois  Adams Quincy 49/46  49/44  31/28  39/38  44/40  45/41  46/43 
Macoupin Nilwood 47/44  39/32  30/25  38/35  43/40  41/39  41/38 
Peoria Peoria 44/41  52/47  29/26  32/30  44/40  36/33  52/44 
Peoria Peoria Heights 52/49  60/54  36/32  37/35  49/44  42/39  58/50 
Sangamon Springfield 52/47  48/39  31/25  38/36  39/38  40/37  52/45 
East Central Illinois  Champaign Thomasboro 52/48  48/45  34/27  37/35  40/38  42/32  43/38 
McLean Normal 52/47  56/52  35/29  36/34  42/40  34/33  --/-- 
Macon Decatur 49/48  54/50  37/30  40/37  42/40  42/39  50/45 
Southeast Illinois  Effingham Effingham 44/41  48/43  29/26  36/33  41/40  44/39  45/42 
Hamilton Knight Prairie Township 51/47  46/41  41/36  46/41  46/44  47/44  50/46