Abstract
The automobile was first identified as a major contributor to urban air pollution in Los Angeles, California, in the 1940s. With continued growth in the number of motor vehicles and the total number of miles driven, every major urban area worldwide now experiences air pollution problems traceable to its automobiles. Johnson (29) reviews current automotive emissions issues. Motor vehicle emissions, and their atmospheric derivatives, include reg ulated or criteria pollutants, for which National Ambient Air Quality Stan dards (NAAQS) are set, and unregulated pollutants, the myriad of pollutants for which no standards exist. The contribution of motor vehicles to regulated
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