Oregon Revised Statutes Public Health and Safety § 468A.390

(1) If the need for a motor vehicle pollution control system inspection program is identified for an area in the State of Oregon Clean Air Act Implementation Plan, then the Environmental Quality Commission, by rule, shall designate boundaries, in addition to the areas specified in ORS 815.300 (2)(a) and (b), within which motor vehicles are subject to the requirement under ORS 815.300 to have a certificate of compliance issued under ORS 468A.380 to be registered or have the registration of the vehicle renewed.

(2) Whenever the Environmental Quality Commission designates boundaries under this section within which vehicles are subject to the requirements of ORS 815.300, the commission shall notify the Department of Transportation and shall provide the Department of Transportation with information necessary to perform the Department of Transportation's duties under ORS 815.300.