Abstract
Under the natural ventilation conditions, two stage nitrogen oxides (NOx), carbon monoxide (CO) and total suspended particles (TSP) in the air of GuanJiao tunnel were monitored. GuanJiao tunnel is located in plateau region and diesel traction trains run through it. Time and space distribution of NOx, CO and TSP content in the tunnel were analyzed. The results show that the harmful gas concentration of freight train is higher than passenger train under the natural ventilation conditions. 15 min after the train run through the tunnel, NOx concentrations were less than 2 mg/m3, CO concentrations were less than 3mg/m3, which meet the standard operating ventilation of the ‘operational railway tunnel ventilation design specifications’ (TB10068-2000).
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