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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 4/17  4/18  4/19  4/20  4/21  4/22  4/23 
Chicago Metropolitan  Cook Alsip 47/44  45/43  50/42  71/66  54/44  45/42  45/44 
Cook Chicago - ComEd 49/45  48/46  51/44  --/--  58/47  45/43  46/45 
Cook Chicago - SWFP 48/41  49/47  51/48  64/59  52/41  43/42  47/44 
Cook Chicago - Taft 49/43  46/44  50/42  72/66  51/42  46/42  44/43 
Cook Cicero 49/45  45/42  50/42  70/63  55/45  45/40  44/42 
Cook Des Plaines 49/43  46/44  53/46  71/65  47/30  45/42  45/43 
Cook Evanston 49/43  50/47  52/48  66/61  49/44  44/42  45/44 
Cook Lemont 51/45  42/38  59/55  75/70  57/51  52/45  --/-- 
Cook Northbrook 53/45  46/45  50/46  71/64  51/45  44/41  44/42 
Cook Schiller Park 37/33  41/38  47/37  67/61  40/32  40/34  37/35 
DuPage Lisle 47/42  41/38  56/48  68/63  50/44  51/43  42/40 
Kane Elgin 43/41  44/42  58/47  66/61  45/41  52/45  48/44 
Lake Zion 51/48  50/48  52/50  69/66  55/48  47/44  46/45 
McHenry Cary 37/36  42/39  43/41  57/53  43/37  47/42  41/39 
Will Braidwood 47/45  51/46  55/52  73/68  59/50  53/49  50/46 
Metro East  Jersey Jerseyville 47/44  57/53  67/63  75/70  55/47  50/47  50/45 
Madison Alton 54/50  58/55  66/62  73/69  55/48  53/50  53/49 
Madison Maryville 57/47  61/58  68/64  72/69  59/51  54/51  54/51 
Madison Wood River 53/49  57/54  65/61  72/68  52/40  51/47  49/45 
Randolph Houston 63/59  64/60  71/68  71/68  53/50  57/53  58/55 
St. Clair East St. Louis 53/49  63/57  64/62  71/66  49/44  49/47  53/49 
Northern Illinois  Rock Island Rock Island 45/42  55/49  64/61  65/62  55/41  50/48  47/42 
Winnebago Loves Park 45/38  57/52  62/54  68/64  46/40  51/49  53/48 
West Central Illinois  Adams Quincy 46/38  61/58  71/67  62/60  50/46  56/54  55/53 
Macoupin Nilwood 52/47  59/55  64/60  72/68  52/47  52/48  52/48 
Peoria Peoria 43/40  58/54  61/58  70/65  48/42  53/50  54/50 
Peoria Peoria Heights 41/38  53/50  60/57  66/63  47/41  48/45  49/46 
Sangamon Springfield 38/36  51/48  53/51  59/57  46/39  46/41  48/45 
East Central Illinois  Champaign Thomasboro 51/47  56/52  54/50  69/65  49/46  48/45  49/46 
McLean Normal 43/41  59/55  62/58  73/70  53/44  53/49  57/51 
Macon Decatur 51/48  60/57  64/60  72/67  52/47  54/51  54/49 
Southeast Illinois  Effingham Effingham 56/50  59/55  63/58  66/63  55/48  53/49  51/48 
Hamilton Knight Prairie Township 60/56  63/60  68/63  67/63  58/54  53/50  54/50 

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