Smog & Emission Checks in Illinois
Many vehicles registered in Illinois are required by the state's Environmental Protection Agency (EPA) to have their emissions checked every two years. A notice will be sent to you when it is time to get your car smog-checked.
In many states, failing to obtain a smog certificate makes it illegal to register and operate the vehicle. But in Illinois, it also makes the driver illegal. If you do not get your vehicle tested on schedule, or you do not bring a failing vehicle into compliance, your Illinois driver's license may be suspended.
The State of Illinois EPA oversees smog testing. The type of test varies based on the age and type of the vehicle. You can get a lot of your questions about emissions inspections answered on the EPA's FAQ page.
To have your vehicle checked, drive it to your nearest emissions inspection station. Bring along your test notice, if you have it. The results of the test will be automatically transmitted to the Secretary of State and the EPA.
Most gasoline-powered cars model year 1996 or newer are subject to emissions testing after they are 4 years old. Heavy duty trucks 2007 or newer are also subject to testing if they weigh between 8,501 pounds and 14,000 pounds.
Illinois does not currently have a program for reporting gross polluters or smoking vehicles. But you can be proactive by reducing your own impact on the environment. See the Illinois EPA's Green Tips to find out how you can do more to reduce pollution.
In these counties, all cars must be smogged except exempt vehicles:
- All of Cook County
- All of Dupage County
- All of Lake County
In several other counties, all cars must be smogged EXCEPT those registered in the specific ZIP codes. Visit the EPA's website for a listing of these zip codes.Local Smog Check Stations
Choose a County
- De Kalb
- De Witt
- Du Page
Other Topics in This Section
- Jo Daviess
- La Salle
- MC Donough
- MC Henry
- MC Lean
Organ Donation Survey
- Register Car
- Registration Renewal
- Registration & Insurance
- Replacing a Lost Registration
- RV & Motorhome Registration
- Custom Built Car Registration
- Boat Registration and Licenses
- Title Transfers
- Replacing a Lost Title
- Salvaged Vehicles
- Special Vehicles
- Drivers with Disabilities
- License Plates & Placards
- Smog & Emission Checks
Are you currently registered as an Organ Donor?
Thank you! Besure to keep your registration up to date.Update Your Organ
Donor Information ▸