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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 7/22  7/23  7/24  7/25  7/26  7/27  7/28 
Chicago Metropolitan  Cook Alsip 50/48  40/32  41/37  44/42  65/54  47/44  37/30 
Cook Chicago - ComEd 55/49  34/29  36/32  41/39  66/55  44/41  32/27 
Cook Chicago - SWFP 48/46  39/27  29/27  40/38  66/57  39/36  24/23 
Cook Chicago - Taft 51/44  35/25  26/24  38/35  78/61  37/34  25/23 
Cook Cicero 59/52  37/28  32/29  40/38  76/63  41/40  32/27 
Cook Des Plaines 56/52  35/29  30/29  45/39  81/66  41/39  30/26 
Cook Evanston 66/55  30/28  34/28  45/38  82/69  41/40  26/25 
Cook Lemont 53/47  37/28  37/34  41/39  57/46  38/36  35/32 
Cook Northbrook 59/56  30/28  30/28  49/43  77/64  42/40  27/25 
Cook Schiller Park 49/44  38/28  27/26  39/35  79/58  38/33  29/25 
DuPage Lisle --/--  --/--  --/--  --/--  --/--  --/--  --/-- 
Kane Elgin 53/47  39/33  40/36  40/39  53/46  39/36  32/31 
Lake Zion 61/54  29/28  30/28  50/46  80/68  41/41  26/25 
McHenry Cary 50/45  39/34  40/35  41/40  53/48  39/36  33/31 
Will Braidwood 44/40  37/35  53/47  42/38  37/33  41/39  42/35 
Metro East  Jersey Jerseyville 66/55  42/36  45/41  47/38  44/39  39/36  28/29 
Madison Alton 83/74  47/44  48/45  48/41  61/49  46/40  30/29 
Madison Maryville 69/63  49/44  49/46  52/44  63/54  48/48  33/31 
Madison Wood River 83/73  --/--  --/--  46/40  65/48  45/39  29/28 
Randolph Houston 59/54  51/45  50/47  58/51  55/46  53/51  43/40 
St. Clair East St. Louis 70/63  48/44  49/46  50/36  53/48  50/43  33/29 
Northern Illinois  Rock Island Rock Island 52/43  33/32  37/34  37/34  50/43  34/31  30/27 
Winnebago Loves Park 51/47  36/33  43/37  43/41  54/47  39/35  37/32 
West Central Illinois  Adams Quincy 39/32  36/34  38/36  44/40  49/42  36/35  30/28 
Macoupin Nilwood 71/57  49/44  45/42  46/46  39/35  38/36  32/29 
Peoria Peoria 40/38  43/41  49/44  40/36  39/32  41/39  33/29 
Peoria Peoria Heights 46/43  43/41  50/47  45/39  40/33  42/39  34/30 
Sangamon Springfield 74/54  45/42  43/40  45/37  40/37  36/34  28/26 
East Central Illinois  Champaign Thomasboro 59/54  41/35  41/38  43/34  41/36  42/37  37/28 
McLean Normal 52/47  48/44  52/47  42/40  50/40  44/40  35/30 
Macon Decatur 63/55  47/42  48/44  44/38  50/44  42/38  32/29 
Southeast Illinois  Effingham Effingham 57/54  43/37  42/35  41/34  54/47  43/39  34/30 
Hamilton Knight Prairie Township 61/56  43/38  41/38  50/43  51/45  48/45  35/33 

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