In Illinois the emission testing is done by the state (or was when I lived there.) And, I believe - only in metro areas.
Pomtzu - Delaware is a comparatively small state. There is a lot of ground to cover in Illinois, Texas, California, Alaska for example.
California requires emission testing as well but you have to go to private vendor. There are plenty of them.
Both states, in my experience, only test emissions and frequency is based on the age of the vehicle.
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