Ambient Levels in the Environment

Various polycyclic aromatic hydrocarbons, carbonyl arenas, polycyclic nitro-aromatics, aza arenes, N-nitroso compounds, and other carcinogens have been detected in ambient air (Hughes et al, 1980 Kneip et al, 1983 Spiegelhalder and Preussman, 1983). Diesel exhaust particles 

The capacity for benzo[a]pyiene metabolism (viz. aryl hydrcx arbon hydroxylase activity) in fish and shellfish can be used as a measure of the induction of this enzyme by environmental polycyc c hydrocarbon pollutants and has been suggested (Mix and Schaffer, 1979 Kuidec et 

In addition to many organic chemicals, carcinogenic metals such as cadmium (Degraeve, 1981) are present in significant amounts in the environment, particularly near industries using large amounts of such metals. 

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