【摘要】 在西安城市交通隧道内设３ 个空气监测点，对通过隧道的汽车排气形成的污染物浓度、隧道内风速、过往隧道的交通量进行采样、观测和统计。根据实测数据用大气扩散方程求得西安城市道路汽车平均单车 Ｃ Ｏ、 Ｈ Ｃ 和 Ｎ Ｏｘ 排放因子分别为３３２７９ ±１２１５８ 、３５７７ ±１８１６ 和４６０５ ±１９８１ ｍｇ／ｍ·ｖｅｈ 。与国外的成果相比，中国城市道路汽车 Ｃ Ｏ 和 Ｈ Ｃ 排放因子分别是国外发达国家汽车排放因子的２ ～９ 倍和３ ～９ 倍，而中国城市汽车 Ｎ Ｏｘ 排放因子约为发达国家汽车排放因子的二分之一。更多还原

【Abstract】 The measurements of the concentrations of the pollutants from motor vehicles at three monitoring points inside the Xi’an road tunnel,the observations of meteorological conditions in the Xi’an tunnel and the counting and classification of vehicles passing through the tunnel were conducted.The emission factors of CO,HC and NO x from motor vehicles on urban main road in Xi’an were respectively 33.279±12 158、3 577±1 816 and 4 605±1 981mg/(m·veh) which were derived by using the atmospheric diffusion based on the measured data.In comparison with the emission factors published by developed countries,the CO and HC emission factors of vehicles driving on urban main road in our country were nearly 2～9 times and 3～9 times those of advanced countries,respectively.However,the level of NO x vehicular emission in China was half of other advanced countries.Vehicular Emission Factors of Pollutants fro m Motor Vehicleson U更多还原