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E1 9512-415 M ( Carbon monoxide (CO) concentration within the Cross Harbor Tunnel in Hong Kong was investigated. Non-air-conditioned double deck buses travelling through the tunnel were used in the study to monitor the CO concentration and the distribution of CO in the tunnel. The Cross Harbor Tunnel was designed and built with a semi-transverse ventilation system during the middle of the 1960s. The quantity of fresh air was calculated according to the dilution required to keep CO fromdoi:10.1016/0160-4120(96)00028-1 fatcat:znjnsxbo6fdbxjtqkyataqndqa