Abstract
The ambient concentrations of polycyclic aromatic hydrocarbons (PAH) (including biphenyl) and nitroarenes were measured during a wintertime, high-NO x episode at a location in Southern California. Daytime and night-time ambient air samples were collected using Hi-vol filters, polyurethane foam (PUF) plugs and Tenax-GC solid adsorbent. 2-Nitrofluoranthene was the most abundant particle-associated nitroarene, but higher concentrations of 1- and 2-nitronaphthalene, methylnitronaphthalenes and 3-nitrobiphenyl were observed on the PUF plugs. Our data show that the ambient concentrations of the more volatile PAH and nitroarenes can be far greater than those of the less volatile species, and suggest that the most abundant nitroarenes in ambient air arise from atmospheric transformations of PAH emitted from combustion sources.
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