VEHICLE EMISSIONS CONTROLS AND AMBIENT AIR QUALITY

This paper was presented at the Society of Automotive Engineers Jubilee Conference, Melbourne, May 1977 as paper 26. A methodology has been described which relates vehicle CO emission rates, traffic activity, ambient CO concentrations. The use of this methodology has indicated that an average vehicle CO emission rate of 16 g/km would be adequate for attainment of the U.S. CO air quality standard, even in the most heavily travelled portions of urban areas. A Du Pont modelling technique was employed to calculate future vehicle use and hydrogen projections. The hydrocarbon projections showed that continued replacement of older vehicles by new ones meeting the current U.S. exhaust hydrocarbon emission standard of 0.93/km for light duty vehicles will extend the existing downtrend of total man-made hydrocarbon emissions into the 1980's, even in the absence of further controls on stationary sources. /TRRL/