Short answer: Depends on your address for most vehicles
| Emissions | Emissions test in the Chicago area (Cook, DuPage, Lake and parts of Kane, Kendall, McHenry and Will) and Metro East (parts of Madison, Monroe and St. Clair) for most 1996+ gasoline vehicles once they are four years old. The official test is free. Kane, Kendall, McHenry, Will, Madison, Monroe and St. Clair are only partly covered (by ZIP code). |
|---|---|
| Safety | No periodic safety inspection for personal vehicles. |
| Official emissions test | Free Free of charge Source: Illinois EPA testing FAQ (PDF) |
| Find a station | Illinois Air Team testing locations |
Sources: Illinois EPA: Vehicle Emissions Testing Program · Illinois Air Team: Does my vehicle need to be tested?. Checked 2026-10-04.
Stations in St. Clair County
Use the official Illinois Air Team testing locations to find a licensed station near you.
Featured stations: none yet. Paid listings are labeled "Featured · paid placement".
Frequently asked
Do I need an emissions test in St. Clair County, Illinois?
Possibly — only part of St. Clair County is inside the testing area. Emissions test in the Chicago area (Cook, DuPage, Lake and parts of Kane, Kendall, McHenry and Will) and Metro East (parts of Madison, Monroe and St. Clair) for most 1996+ gasoline vehicles once they are four years old. The official test is free.
Do I need a safety inspection in St. Clair County?
No periodic safety inspection for personal vehicles.