Oregon Revised Statutes Public Health and Safety § 468A.365

(1) Determine and adopt by rule criteria for certification of motor vehicle pollution control systems. In determining the criteria the commission shall consider the following:

(2) Prescribe by rule the manner in which a motor vehicle pollution control system shall be tested for certification. The rules may prescribe a more rigorous inspection procedure in the areas designated under ORS 815.300 (2)(a), including any expansion of such boundary under ORS 815.300 (2)(b), in order to reduce air pollution emissions in those areas of the state. No such rule shall require testing for certification more often than once during the period for which registration or renewal of registration for a motor vehicle is issued. No rule shall require testing for certification of a motor vehicle that is exempted from the requirement for certification under ORS 815.300.

(3) Issue certificates of approval for classes of motor vehicle pollution control systems which, after being tested by the commission or by a method acceptable to the commission, the commission finds meet the criteria adopted under subsection (1) of this section.

(4) Designate by rule classifications of motor vehicles for which certified systems are available.

(5) Revoke, suspend or restrict a certificate of approval previously issued upon a determination that the system no longer meets the criteria adopted under subsection (1) of this section pursuant to procedures for a contested case under ORS chapter 183.

(6) Designate suitable methods and standards for testing systems and inspecting motor vehicles to determine and insure compliance with the standards and criteria established by the commission.

(7) Except as provided in ORS 468A.370, contract for the use of or the performance of tests or other services within or without the state.