Ill. Admin. Code tit. 92, § 460.120 – Applicability

a) Intrastate Carriers of Property or Passengers and Interstate Carriers of Passengers:
Effective July 1, 2000, each diesel-powered vehicle that is registered for a gross weight of more than 16,000 pounds, that is registered within the affected area (as defined in Section 460.110) and that is a 2 year or older model year shall be inspected annually for compliance with this Part. [625 ILCS 5/13-109.1]
b) Diesel-powered vehicles being operated on plates issued pursuant to Section 3-815(c) of the Code (Farm Truck Registration (i.e., license plate)) are exempt from the diesel emission inspection requirements set forth in this Part. [625 ILCS 5/13-109.3]
c) Units of local government within the affected areas, including home rule units, shall not require or conduct a diesel emission inspection program that does not meet or exceed the standards of the diesel emission inspection provided for in this Part. [625 ILCS 5/13-117]