Polycyclic aromatic hydrocarbons (PAHs), released (in the vapor phase) into the atmosphere via combustion of fossil fuels, are believed to adsorb on atmospheric particulate surfaces (1,2). The chemical behavior of an adsorbed PAH is strongly dependent on the characteristics of the adsorbent (3-5).Studies of chemical transformations of adsorbed PAHs usually require that the PAHs and/or their transformation
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