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Their environmental cycling through wet deposition has hardly been studied. NPAHs were only found in the particulate phase with 9-nitroanthracene being predominant followed by 2-nitrofluoranthene. Among NMAHs, 4-nitrophenol showed the highest abundance in both phases. The levels found for nitrophenols were in the same range or lower than those reported in the s and s.
NMAHs, is determined by an interplay between gas-particle partitioning in the aerosol and dissolution during in- or below-cloud scavenging. Shahpoury, P. These substance groups were also suggested to play a role in light absorption properties of biomass burning particulate matter PM Lin et al.
Some NPAHs, e. NPAHs are also formed through reactions in the aerosol condensed phase Keyte et al. Photolysis of NPAHs results in the formation of other oxygenated and nitrated species such as hydroxynitro-PAHs, quinones, and nitrated quinones Bandowe and Meusel, Unlike NPAHs, there is no agreement on distinct formation pathways of individual OPAHs — to various extents, they originate from both primary and secondary sources Walgraeve et al.
The contribution of primary sources is expected to be higher during the cold season, with heating activities dominating the vehicular emission Lin et al. Moreover, quinones, a prominent sub-class of OPAHs, are precursors of environmentally persistent free radicals Borrowman et al. Nitrated mono-aromatic hydrocarbons NMAHs are composed of several chemically related compound classes such as: nitrophenols, nitroguaiacols, nitrocatechols, and hydroxy-nitrobenzoic i. Nitrophenols are emitted from primary sources, particularly biomass burning but also traffic exhaust Tremp et al.