ABSTRACT
Generally, the goal of a motor vehicle pollution control programme is to reduce emissions from motor vehicles in use to the degree (within reason) necessary to achieve healthy ambient air quality for mobile source related pollutants in all areas of a city or country as rapidly as possible. For reasons of impossibility or impracticality, if this goal is not achievable, emissions shall be reduced to the practical limits of effective technological, economic, and social feasibility. Achievement of these alternative general goals requires more specific goals, namely: setting emission standards which, if met, would achieve the desired reductions, implementing programmes which enforce compliance with these standards, and controlling, where needed, vehicle usage. These emission reduction goals should be achieved in a manner which is equitable with respect to the population groups affected and, where direct trade-offs between alternative approaches exist, in the least costly manner.
