Utah Code § 19-1-405: Air Quality Board duties -- Rulemaking.

(1) By following the procedures and requirements of Title 63G, Chapter 3, Utah Administrative Rulemaking Act, the Air Quality Board may make rules to:

(a) certify a motor vehicle on which conversion equipment has been installed if:

(i) before the installation of conversion equipment, the motor vehicle does not exceed the emission cut points for:

(A) a transient test driving cycle, as specified in 40 CFR 51, Appendix E to Subpart S; or

(B) an equivalent test for the make, model, and year of the motor vehicle; and

(ii) the motor vehicle's emissions of regulated pollutants, when operating with clean fuel, is less than the emissions were before the installation of conversion equipment;

(b) recognize a test or standard that demonstrates a reduction in emissions; or

(c) recognize a certification standard from another state.

(2) A reduction in emissions under Subsection (1)(a)(ii) is demonstrated by:

(a) certification of the conversion equipment by the federal Environmental Protection Agency or by a state whose certification standards are recognized by the Air Quality Board;

(b) testing the motor vehicle, before and after the installation of the conversion equipment, in accordance with 40 CFR 86, Control of Air Pollution from New and In-use Motor Vehicle Engines: Certification and Test Procedures, using all fuel the motor vehicle is capable of using; or

(c) any other test or standard recognized by the Air Quality Board in rule.