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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 9/24  9/25  9/26  9/27  9/28  9/29  9/30 
Chicago Metropolitan  Cook Alsip 55/49  63/53  73/62  68/61  65/60  74/64  28/24 
Cook Chicago - ComEd 52/52  59/44  59/52  61/55  60/54  71/58  25/20 
Cook Chicago - SWFP 59/53  58/49  65/65  53/50  54/51  63/52  26/24 
Cook Chicago - Taft 51/44  52/40  69/52  64/54  62/56  66/54  26/24 
Cook Cicero 46/40  51/39  54/42  57/49  55/47  63/53  25/20 
Cook Des Plaines 52/45  47/40  65/54  62/54  59/53  58/48  25/23 
Cook Evanston 59/57  54/53  65/60  63/59  60/51  59/42  29/27 
Cook Lemont 49/46  56/47  75/61  64/52  67/54  62/53  21/19 
Cook Northbrook 50/45  45/36  64/54  61/53  58/53  61/51  27/25 
Cook Schiller Park 44/37  44/32  55/43  61/53  --/--  56/56  27/25 
DuPage Lisle --/--  --/--  --/--  --/--  --/--  --/--  --/-- 
Kane Elgin 54/43  51/41  60/56  68/57  63/58  56/53  22/21 
Lake Zion 50/42  26/31  64/55  59/49  57/51  59/49  30/28 
McHenry Cary 52/44  47/35  65/59  67/58  65/59  59/54  25/23 
Will Braidwood 54/49  59/53  70/63  66/60  75/64  64/62  25/23 
Metro East  Jersey Jerseyville 60/51  73/62  68/61  64/59  59/56  57/53  54/44 
Madison Alton 59/50  73/63  79/72  74/67  62/59  62/57  77/66 
Madison Maryville 56/50  68/61  71/67  74/67  60/58  71/60  80/70 
Madison Wood River 58/49  69/60  75/65  72/65  60/57  62/52  83/68 
Randolph Houston 62/57  69/65  78/74  79/74  67/62  75/70  84/77 
St. Clair East St. Louis 51/44  64/57  72/65  75/62  71/60  63/56  79/67 
Northern Illinois  Rock Island Rock Island 49/45  58/51  65/59  64/57  67/60  58/51  30/25 
Winnebago Loves Park --/--  --/--  70/64  69/64  73/67  56/52  30/24 
West Central Illinois  Adams Quincy 53/48  53/47  61/58  66/62  66/61  61/55  34/30 
Macoupin Nilwood 55/51  59/56  64/60  62/57  62/57  61/58  47/38 
Peoria Peoria 53/46  53/46  63/57  66/59  64/55  60/52  29/25 
Peoria Peoria Heights 57/51  59/53  66/62  67/62  65/59  62/58  28/25 
Sangamon Springfield 55/50  61/53  62/58  60/54  59/55  60/53  39/33 
East Central Illinois  Champaign Thomasboro 54/47  65/55  66/62  59/53  59/57  61/58  37/32 
McLean Normal 57/52  62/57  68/64  63/57  67/63  69/65  34/30 
Macon Decatur 59/53  62/56  72/67  67/63  66/62  70/63  45/38 
Southeast Illinois  Effingham Effingham 52/52  58/53  65/60  63/56  59/55  65/60  47/35 
Hamilton Knight Prairie Township 55/46  62/58  76/66  69/60  64/58  66/60  62/56 

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