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The development and application of qualification requirements for automotive service technicians and mechanics participating in vehicle emissions inspection and maintenance (I/M) programs is vital to the realization of maximum emissions reductions. Using the existing British Columbia (B.C.) trades qualification system for mechanics as a screening mechanism, the provincial I/M mechanic certification requirements take into account not only skill and knowledge related to automotive emissions control, but knowledge regarding the administrative requirements of the program as well. In addition to rigorous mechanic qualification requirements, the centralized B.C. Inspection program will include loaded-mode testing and NOx measurement, as well as thorough visual and functional inspection of emissions control components.

A test program was conducted to study the effect of ambient conditions on exhaust emissions from a wide variety of automobiles. Twenty-six cars ranging from pre-control production cars to catalyst-equipped prototypes, including rotary, Diesel, and stratified charge cars, were tested at 20°, 50°, 75°, and 110° F. Ambient temperatures above and below 75° F were found to have significant effects on exhaust emissions. The Diesel and stratified charge cars were affected less than production and catalyst-equipped cars by changes in ambient temperature. The use of air conditioners at the 110° F test temperature led to increased emissions and fuel consumption. Hydrocarbon reactivity and aldehyde emissions were not affected by temperature and were lower from the catalyst cars at all temperatures.