Recognizing the significant contribution of motor vehicles to air pollution in a number of urban areas, the Congress enacted the Clean Air Amendments of 1970 (84 Stat. 1676) that require substantial reductions in carbon monoxide and hydrocarbon emissions from light-duty motor vehicles beginning with the 1975 model year. Questions as to the technical feasibility of emission standards, particularly the 1975-76 standards, their economic impact, trade-offs with standards for stationary sources of air pollution, and so on are being explored in other studies and are not the subject of the report. This report instead deals primarily with changes that can be made and techniques that can be used in the planning and operation of transportation systems and facilities to minimize motor vehicle air pollution and its impact. (This report does not deal with transportation controls for air pollution emergency episodes).


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