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Data collected between 1987 and 1996 for PCBs and PAHs in marine sediments at 66 stations in 10 water quality zones in Hong Kong were collated and analysed. Statistical analyses indicate that, during 1995 and 1996, the total PCBs and total PAHs were widely distributed in Hong Kong sediments at background concentrations of 5 to 9.8 μg kg -1 and 40 to 60 μg kg -1 wet weight...