AbstractThe effect of exposure to three concentrations of diesel exhaust on several heptic and pulmonary activities has been tested. After one year of exposure, the ability of liver microsomes to oxidize benzoαpyrene to more polar metabolites was not increased. Further studies with liver microsomes showed that, after several months of exposure, there was no evidence for the induction of either cytochrome P‐450, cytochrome P‐448 or NADPH dependent cytochrome c reductase. The ability of pulmonary microsomes to generate polar metabolites from benzoαpyrene was impaired after one year of exposure to the highest concentration of exhaust (1500 μg m−3). The process by which the exposure causes this inhibition is n
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