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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 |
10/25 |
10/26 |
10/27 |
10/28 |
10/29 |
10/30 |
10/31 |
| Chicago Metropolitan |
Cook |
Alsip |
29/25 |
31/27 |
29/25 |
28/25 |
20/11 |
19/22 |
28/21 |
| Cook |
Chicago - ComEd |
28/24 |
25/23 |
26/22 |
25/22 |
17/10 |
16/19 |
25/18 |
| Cook |
Chicago - SWFP |
29/25 |
25/23 |
26/22 |
28/25 |
24/17 |
17/19 |
26/18 |
| Cook |
Chicago - Taft |
28/25 |
28/24 |
25/22 |
23/20 |
16/10 |
9/16 |
23/15 |
| Cook |
Chicago - University |
24/21 |
22/19 |
22/18 |
21/18 |
14/11 |
8/12 |
18/11 |
| Cook |
Cicero |
25/21 |
24/21 |
23/20 |
20/16 |
9/4 |
5/9 |
17/13 |
| Cook |
Des Plaines |
30/26 |
26/24 |
26/22 |
23/20 |
17/13 |
9/10 |
17/14 |
| Cook |
Evanston |
29/26 |
27/24 |
25/22 |
24/23 |
25/19 |
13/14 |
22/15 |
| Cook |
Lemont |
33/30 |
30/26 |
31/25 |
24/20 |
25/19 |
18/23 |
26/22 |
| Cook |
Northbrook |
32/28 |
29/27 |
28/24 |
24/21 |
18/14 |
8/14 |
22/15 |
| Cook |
Schiller Park |
26/24 |
24/21 |
23/20 |
18/16 |
11/5 |
5/9 |
16/14 |
| DuPage |
Lisle |
30/26 |
29/25 |
28/24 |
24/20 |
17/10 |
14/18 |
24/17 |
| Kane |
Elgin |
33/28 |
28/26 |
27/24 |
24/21 |
21/12 |
11/13 |
21/15 |
| Lake |
Zion |
34/31 |
31/29 |
29/26 |
27/26 |
26/20 |
19/14 |
25/17 |
| McHenry |
Cary |
33/31 |
29/28 |
29/27 |
27/24 |
23/15 |
13/16 |
23/17 |
| Will |
Braidwood |
35/30 |
30/28 |
--/-- |
--/-- |
--/-- |
--/-- |
28/24 |
| Metro East |
Jersey |
Jerseyville |
36/32 |
39/34 |
35/30 |
46/36 |
35/25 |
24/22 |
27/22 |
| Madison |
Alton |
32/27 |
39/34 |
30/25 |
44/37 |
31/19 |
20/18 |
23/18 |
| Madison |
Maryville |
33/29 |
42/38 |
34/28 |
51/41 |
31/23 |
32/29 |
29/26 |
| Madison |
Wood River |
33/27 |
40/35 |
30/24 |
45/36 |
29/19 |
25/22 |
26/20 |
| Randolph |
Houston |
34/30 |
44/40 |
37/29 |
51/45 |
32/25 |
37/33 |
30/27 |
| St. Clair |
East St. Louis |
34/27 |
40/35 |
33/27 |
49/36 |
24/14 |
30/27 |
31/23 |
| Northern Illinois |
Rock Island |
Rock Island |
38/34 |
32/27 |
33/29 |
31/22 |
21/14 |
19/15 |
18/16 |
| Winnebago |
Loves Park |
34/32 |
30/28 |
29/26 |
24/21 |
33/21 |
14/12 |
16/14 |
| West Central Illinois |
Adams |
Quincy |
38/35 |
34/30 |
35/31 |
49/44 |
32/23 |
22/22 |
27/24 |
| Macoupin |
Nilwood |
37/32 |
38/33 |
33/30 |
48/41 |
26/22 |
22/21 |
26/23 |
| Peoria |
Peoria |
36/32 |
31/28 |
32/24 |
32/28 |
14/12 |
18/17 |
22/16 |
| Peoria |
Peoria Heights |
36/30 |
30/27 |
32/26 |
34/29 |
20/15 |
19/20 |
24/19 |
| Sangamon |
Springfield |
37/33 |
34/31 |
34/30 |
46/37 |
28/22 |
22/22 |
29/23 |
| East Central Illinois |
Champaign |
Thomasboro |
31/27 |
30/27 |
30/26 |
37/30 |
19/13 |
21/20 |
25/23 |
| McLean |
Normal |
37/32 |
32/28 |
32/27 |
40/31 |
20/15 |
26/25 |
29/23 |
| Macon |
Decatur |
33/29 |
34/30 |
32/27 |
44/36 |
23/16 |
25/23 |
25/22 |
| Southeast Illinois |
Effingham |
Effingham |
35/31 |
41/36 |
33/28 |
45/40 |
25/20 |
35/31 |
35/30 |
| Hamilton |
Knight Prairie Township |
34/30 |
40/34 |
37/30 |
46/37 |
15/12 |
42/40 |
35/29 |
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