The concentration of BTEX in the air of the main bus stops and buses driven by gasoline, diesel, electricity, liquefied nature gas(LNS) and gas-electricity mixture in the city were investigated using thermal desorption with gas chromatography. BTEX in mobile microenvironment showed in the order gasoline-motor car > diesel-motor car > gas-electricity mixture-motor car > LNS-motor car > electricity-motor car. BTEX occurred most in gasoline-motor car and the concentration is (21. 02 ±9. 51) p,g/m3 and the carcinogenic risk of benzene is varied from 2. 32× 10 -6 to 4. 79 × 10-6 in different kind of buses and all of them are higher than the limit set by USEPA.%用热解析气相色谱法采集分析不同动力公交车微环境中苯系物,研究了江南某旅游城市公交汽油车、柴油车、电车、液化天然气车、油电混合车空气中苯系物的浓度以及主要公交站台的苯系物的浓度.结果表明,公交车微环境中苯系物平均浓度从高到低依次为汽油车＞柴油车＞油电混合丰＞液化天然气车＞电车,其中汽油车苯含量最高,为(21.02±9.51)μg/m3,各动力公交车的苯暴露对公交司机致癌风险为2.32×10-6～4.79×10-6,超过了美国EPA制定的人体致癌风险限值.
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