汽车排放的尾气造成城市空气环境的日益恶化，严重威胁着人们的身体健康。日前已在四川省率先启动的“绿色环保型汽车”即CNG汽车，将为这一难题的解决带来福音。四川省是我国发展CNG汽车工业最早的省，目前的发展水平和规模已居全国首位，加气站的数量与CNG汽车数量分别占全国 Exhaust emissions from vehicles cause the deteriorating air environment in the city, which seriously threatens the health of people. Recently launched in Sichuan Province has taken the lead in the “green car” or CNG car, will bring relief for this problem. Sichuan Province is the earliest province to develop CNG automobile industry in our country. At present, the level and scale of development of CNG have already taken the first place in China. The number of CNG vehicles and CNG vehicles respectively occupy the whole country