The atmospheric chemistry of the 2-to 4-ring polycyclic aromatic hydrocarbons (PAH), which exist mainly in the gas phase in the atmosphere, is dis- cussed.The dominant loss process for the gas-phase PAH is by reaction with the hydroxyl radical, resulting in calculated lifetimes in the atmos- phere of generally less than one day.The hydroxyl (OH) radical-initiated reactions and nitrate (NO3) radical-initiated reactions often lead to the for- mation of mutagenic nitro-PAH and other nitropolycyclic aromatic compounds, including nitrodibenzopyranones.These atmospheric reactions have a significant effect on ambient mutagenic activity, indicating that health risk assessments of combustion emissions should include atmospheric transformation products.-
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Atkinson et al. (1994) studied this question.
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