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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 4/10  4/11  4/12  4/13  4/14  4/15  4/16 
Chicago Metropolitan  Cook Alsip 41/38  56/51  55/53  42/37  38/31  43/42  47/45 
Cook Chicago - ComEd 42/39  51/43  --/--  --/--  33/25  37/33  41/38 
Cook Chicago - SWFP 48/42  56/48  49/47  42/41  39/36  43/41  48/44 
Cook Chicago - Taft 49/37  52/45  49/46  36/33  32/29  38/36  43/40 
Cook Cicero 43/36  52/44  44/42  34/28  32/27  39/36  43/40 
Cook Des Plaines 50/41  55/48  54/48  45/39  34/31  39/38  44/42 
Cook Evanston 47/34  52/46  51/47  42/40  41/35  42/40  48/45 
Cook Lemont 47/42  58/52  53/51  35/32  38/30  45/42  49/47 
Cook Northbrook 50/44  58/51  54/49  41/38  39/33  39/38  44/41 
Cook Schiller Park 37/31  45/41  48/44  36/32  35/28  34/32  39/37 
DuPage Lisle 48/42  54/48  50/47  33/31  35/30  40/38  43/41 
Kane Elgin 50/45  55/51  52/48  42/35  39/33  40/39  45/42 
Lake Zion 55/51  60/53  56/52  45/42  36/35  43/42  51/48 
McHenry Cary 47/42  51/45  45/41  36/32  34/30  36/34  37/34 
Will Braidwood 48/44  59/55  52/50  36/32  39/36  45/44  49/46 
Metro East  Jersey Jerseyville 59/54  55/53  48/44  47/40  44/33  44/42  48/45 
Madison Alton 61/57  58/54  48/45  48/39  44/35  46/44  48/46 
Madison Maryville 64/60  61/56  49/46  44/41  46/34  47/44  52/50 
Madison Wood River 61/55  58/54  46/44  41/36  42/32  43/40  48/46 
Randolph Houston 64/60  60/56  49/47  47/47  48/40  50/47  56/52 
St. Clair East St. Louis 59/55  57/54  48/45  40/36  40/31  46/42  50/47 
Northern Illinois  Rock Island Rock Island 51/49  59/57  57/54  49/37  43/36  49/46  51/47 
Winnebago Loves Park --/--  --/--  --/--  --/--  --/--  --/--  --/-- 
West Central Illinois  Adams Quincy 49/45  61/58  53/50  46/39  37/36  49/46  55/52 
Macoupin Nilwood 61/54  59/55  50/47  40/37  44/33  46/43  51/47 
Peoria Peoria 45/42  58/54  56/49  40/31  40/30  45/43  45/41 
Peoria Peoria Heights 47/44  59/56  57/52  44/35  40/31  41/39  46/43 
Sangamon Springfield 51/46  50/47  45/41  36/31  40/28  39/36  43/41 
East Central Illinois  Champaign Thomasboro 58/50  57/53  49/47  38/33  43/33  41/40  47/44 
McLean Normal 47/43  62/56  53/50  44/37  41/36  46/43  48/44 
Macon Decatur 60/52  62/57  49/47  40/35  44/33  44/42  47/44 
Southeast Illinois  Effingham Effingham 57/54  55/52  50/48  39/38  43/36  44/42  44/42 
Hamilton Knight Prairie Township 62/59  55/53  53/51  40/44  47/43  45/43  51/48 

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