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 70 parts per billion;
Region  County Site 10/25  10/26  10/27  10/28  10/29  10/30  10/31 
Chicago Metropolitan  Cook Alsip 31/27  35/31  24/22  29/27  38/35  29/27  31/25 
Cook Chicago - ComEd 32/26  31/25  22/21  26/24  35/32  27/24  28/23 
Cook Chicago - SWFP 29/25  33/29  22/21  25/24  34/30  28/24  27/24 
Cook Chicago - Taft 24/19  20/16  16/15  20/19  25/22  19/13  --/-- 
Cook Cicero 30/20  31/25  25/23  29/27  35/32  30/27  30/27 
Cook Des Plaines 32/26  31/26  25/22  28/26  35/32  28/23  --/-- 
Cook Evanston 33/29  35/33  24/21  28/26  35/32  29/26  29/26 
Cook Lemont 29/26  35/33  25/23  27/25  38/34  28/27  31/25 
Cook Northbrook 35/29  32/28  26/22  28/27  35/32  27/26  28/26 
Cook Schiller Park 22/18  26/22  23/20  23/20  33/29  24/24  26/20 
DuPage Lisle 35/30  34/30  26/24  30/29  39/35  29/29  31/27 
Kane Elgin 36/29  33/29  25/23  29/29  39/35  29/27  29/27 
Lake Zion 31/28  34/32  23/21  28/27  35/33  29/23  27/26 
McHenry Cary 34/30  32/28  24/22  30/29  37/34  30/27  29/27 
Will Braidwood 31/26  40/35  27/26  32/30  41/38  31/29  32/30 
Metro East  Jersey Jerseyville 38/33  46/41  32/30  29/27  36/33  33/29  33/31 
Madison Alton 38/35  49/46  31/30  31/27  37/33  30/28  30/27 
Madison Maryville 42/36  55/51  34/32  31/28  41/35  35/32  30/27 
Madison Wood River 37/32  47/43  31/29  29/26  34/30  30/28  27/25 
Randolph Houston 35/30  35/26  28/26  25/23  30/28  30/27  26/23 
St. Clair East St. Louis 33/27  43/40  29/26  26/23  35/29  27/24  23/21 
Northern Illinois  Rock Island Rock Island 34/28  43/38  30/27  37/36  37/33  29/28  33/31 
Winnebago Loves Park 39/31  34/29  24/23  31/30  37/35  29/28  29/26 
West Central Illinois  Adams Quincy 38/32  48/42  31/28  32/29  37/33  31/28  33/31 
Macoupin Nilwood 37/32  47/42  31/29  29/27  37/33  32/28  33/31 
Peoria Peoria 30/23  39/34  25/24  29/26  32/29  27/24  34/31 
Peoria Peoria Heights 35/29  46/42  29/28  32/30  39/35  32/28  38/33 
Sangamon Springfield 34/29  44/40  28/27  30/29  37/34  32/28  33/31 
East Central Illinois  Champaign Thomasboro 26/23  40/35  34/28  27/25  39/36  31/26  33/31 
McLean Normal 36/29  42/38  28/26  29/27  40/36  30/26  34/32 
Macon Decatur 34/27  41/34  29/27  29/28  39/35  31/26  31/29 
Southeast Illinois  Effingham Effingham 35/30  44/41  34/31  32/28  39/37  30/27  34/31 
Hamilton Knight Prairie Township 39/33  49/46  42/23  28/27  40/36  33/30  32/30