采取具体措施控制交通工具对城市空气造成严重污染的巴黎来讲已成为迫在眉睫急需解决的问题。众所周知,汽车排放的废气中含有大量的一氧化碳、氮氧化物、以及碳氢化合物等有害物质。巴黎地区100多万辆注册车辆的尾气排放已对空气的污染带来愈来愈严重的后果。 目前,法国把空气污染程度划分三级,最高限额为第三级。具体地说就是把每立方米空气中,臭氧的含量达到或超过300微克;氮氧化物 In Paris, concrete measures to control the heavy pollution caused by transport to urban air have become an urgent problem to be solved urgently. As we all know, the exhaust gas emitted by automobiles contains a lot of harmful substances such as carbon monoxide, nitrogen oxides and hydrocarbons. Emissions from more than a million registered vehicles in the Paris area have had even more serious consequences for air pollution. At present, France divides the level of air pollution by three levels and the maximum level by third level. Specifically, each cubic meter of air, the ozone content reached or exceeded 300 micrograms; nitrogen oxides