Abstract
Polycyclic aromatic hydrocarbons (PAH) adsorbed on soot particles do not react significantly when exposed to ambient laboratory atmospheres for periods of up to 230 days or to air containing 5 ppm SO 2 for 99 days. Exposure to air containing 10 ppm NO x gave decreasing recoveries of PAH with time. It has been established that the reactivity of PAH under these conditions is anthanthrene > benzo(a)pyrene > benzo(ghi)perylene > benz(a)anthracene > pyrene > benzo(e)pyrene > chrysene > fluoranthene > phenanthrene ~ coronene. Evidence is presented which indicates that even in the absence of photolysis or ozone that PAH in ambient NO x polluted air can be converted to nitro derivatives. These nitration reactions will reduce the carcinogenic content of polluted air, as the 6-nitro-benzo(a)pyrene, 7-nitrobenz(a)anthracene and nitrochrysene derivatives that are formed, in contrast to the parent hydrocarbons, are non-carcinogenic.
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