a maximal 50-fold induction of AHH activity by 8 hr, which persisted for 48 hr. The same injections to adult F1 mice revealed only a 4- to 7—fold increase in lung AHH activity, compared to the large fetal induction ratio. References External links National Pollutant Inventory - Polycyclic Aromatic Hydrocarbon Fact Sheet Carcinogens Hepatotoxins Polycyclic aromatic hydrocarbons