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Wet deposition was the main process for atmospheric removal of PAHs, HCHs, and HCB. In addition, warm season revolatilization from soils and melting snow with subsequent condensation at low temperature were significant for volatile PAHs, HCB, low chlorinated PCBs, and endosulfans. Reaction with OH radicals was not a significant loss process of HCHs and HCB in remote areas, dominated by wet deposition, whereas PCBs and PAHs were significantly removed by both wet deposition and OH radical oxidation, the latter dominating in the highest al