Illinois Ozone 8-hour Exceedance Summary
8-hour Exceedances Summary
Values in each column is 8-hour concentration - standard of 70 parts per billion;
| Region | County | Site | 2024 None to Date |
| Chicago Metropolitan | Cook | Alsip | |
| Cook | Chicago - Com Ed | ||
| Cook | Chicago - SWFP | ||
| Cook | Chicago - Taft | ||
| Cook | Cicero | ||
| Cook | Des Plaines | ||
| Cook | Evanston | ||
| Cook | Lemont | ||
| Cook | Northbrook | ||
| Cook | Schiller Park | ||
| DuPage | Lisle | ||
| Kane | Elgin | ||
| Lake | Zion | ||
| McHenry | Cary | ||
| Will | Braidwood | ||
| Metro-East | Jersey | Jerseyville | |
| Madison | Alton | ||
| Madison | Maryville | ||
| Madison | Wood River | ||
| Randolph | Houston | ||
| St. Clair | East St. Louis | ||
| Northern Illinois | Rock Island | Rock Island | |
| Winnebago | Loves Park | ||
| West Central Illinois | Adams | Quincy | |
| Macoupin | Nilwood | ||
| Peoria | Peoria | ||
| Peoria | Peoria Heights | ||
| Sangamon | Springfield | ||
| East Central Illinois | Champaign | Thomasboro | |
| McLean | Normal | ||
| Macon | Decatur | ||
| Southeast Illinois | Effingham | Effingham | |
| Hamilton | Knight Prairie Township |