O Xi

Interestingly, these nitro-PAH lactones are not found in primary emissions of particulate POM; they are formed in atmospheric reactions (Atkinson and Arey, 1994; Arey, 1998a, and references therein; see Section F.2).

Recently, Enya and co-workers (1997) identified another very powerful type of direct mutagen, the nitro-PAH ketone 3-nitrobenzanthrone (3-nitro-7//-benz[<ie]anthracen-7-one, XXIV), in extracts of particles from ambient air and diesel exhaust:

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