重庆城区交通道路两旁街市林立，又处于长江嘉陵江交汇处的峡谷地带，空气扩散条件不好，机动车行驶排放的废气和热浪蒸人，刺人眼界；机动车行驶的噪声使城市交通显得嘈杂。机动车燃油产生含b百种不同性质化合物的废气，造成空气污染．1998年五月，重庆城区交通干道空气环境质 Chongqing downtown traffic roads on both sides of the market everywhere, and in the junction of the Yangtze River Jialing River Canyon, air diffusion conditions are not good, motor vehicles exhaust emissions and heat waves steamed, stinging eye; motor vehicle noise makes the city traffic noisy. Motor vehicle fuel containing b hundred different nature of the compounds of the exhaust gas, causing air pollution. 1998 May, Chongqing urban traffic trunk air quality