The purpose of this code is to provide guidance to provincial transportation and environmental regulatory agencies regarding light-duty vehicle inspection and maintenance programs as a means of reducing excess exhaust and evaporative emissions of volatile organic compounds, nitrogen oxides, carbon monoxide, and particulate matter from in-use motor vehicles in large urban centres. The code is intended as a basis for implementing consistent and uniform control measures employing the latest technology for the testing of in-use motor vehicles across Canada. Training requirements are included in the code to help maintain efficient inspection station and repair shop operation as well as the health and safety of the motorists who participate in the programs. This document includes an outline of the legislative and policy considerations behind the code, the basic program parameters, and information on test procedures and equipment, quality control and assurance, repair technician and facility certification, and development of public awareness.