Emissions testing — Illinois Permit Test

Emissions testing on the Illinois permit test — 2 rules, each with the reason behind it and a question on it while it is fresh.

The rules

Certain Illinois vehicles must pass an Illinois Environmental Protection Agency emissions test before the Secretary of State will renew the registration, and owners are told the scheduled test month and year.

The test blocks the renewal rather than the driving. Missing it means the registration simply cannot be renewed.

In compliance with the Clean Air Act, certain vehicles in various areas of Illinois must pass an Illinois Environmental Protection Agency (IEPA) emissions test for the Secretary of State’s office to renew the vehicle’s registration. Notice is provided to owners of the scheduled test month and year for their vehicles.

Illinois Rules of the Road 2026, p.98

Emissions testing is required in all of Cook, DuPage and Lake counties and in parts of Kane, Kendall, McHenry, Will, Madison, Monroe and St. Clair counties, and an owner moving out of a testing area must tell the Secretary of State.

Three counties are covered entirely and seven only in part, so an address change can end the requirement. Telling the state is what stops the notices.

A vehicle emissions test is required in the following counties: all of Cook, DuPage and Lake, and parts of Kane, Kendall, McHenry, Will, Madison, Monroe, and St. Clair.

Illinois Rules of the Road 2026, p.98

On the test

What does an Illinois emissions test failure prevent?

Renewal of the vehicle registration. The test blocks the renewal rather than the driving. Missing it means the registration simply cannot be renewed. Illinois Rules of the Road 2026, p.98: “In compliance with the Clean Air Act, certain vehicles in various areas of Illinois must pass an Illinois Environmental Protection Agency (IEPA) emissions test for the Secretary of State’s office to renew the vehicle’s registration. Notice is provided to owners of the scheduled test month and year for their vehicles.”

How this works

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All Illinois permit topics

Where these come from

Every rule here is checked against Illinois Rules of the Road 2026, published by the Illinois Secretary of State, and against the state code itself. Last checked 2026-09-21.