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Abstract
This report summarizes our work on the physical and chemical characterization of diesel exhaust with emphasis on the extractable and benzo( a)pyrene content of the particulate. Compared with benzene-ethanol, methylene chloride is an unsuitable extraction solvent for the measurement of benzo( a)pyrene in diesel particulate. Using recently developed analytical techniques, a series of studies of sampling parameters shows that the composition of the particulate is fixed when it leaves the tailpipe and that the composition does not change with dilution. Further, sampling results in a dilution tunnel agree quite well with those observed in open air sampling. Finally, based on various air quality models and projections of the diesel sales-emission scenario, we find that the light-duty diesel will be a minor contributor to total ambient particulate.
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