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前言六十年代以来,柴油车数量不断增加,柴油车在隧道内行驶时放出的CO气体量极少,仅为汽油车的十分之一至百分之一。与此同时,却放出大量烟雾和具有刺激性臭味的甲醛和二氧化硫等气体,严重影响行车安全可见视距和舒适度。因此,七十年代隧道内烟雾污染危害性被世界各国所重视并研究其对策。国产柴油车的现状是吨位重,排烟量大而且浓度高。即使是汽油载重车和超载公共汽车爬坡时亦会因发动机性能差而放出大量烟雾,致使隧道内往往CO浓度尚未到达容许卫生标准而烟雾已使隧道内安全可见视距和舒适度大大降低。因此,隧
Preface Since the 1960s, the number of diesel vehicles has been increasing. The amount of CO gas emitted by diesel vehicles traveling in tunnels is extremely low, only one tenth to one percent of that of gasoline vehicles. At the same time, it emits a lot of smoke and irritating odor of formaldehyde and sulfur dioxide and other gases, seriously affecting traffic safety visible line of sight and comfort. Therefore, the dangers of smog pollution in the tunnel in the seventies are valued by all the countries in the world and their countermeasures are studied. The current status of domestic diesel vehicles is heavy tonnage, large quantities of smoke and high concentrations. Even when petrol trucks and overloaded buses climb up, large amounts of smoke are released due to poor engine performance. As a result, CO concentrations in the tunnels have not yet reached the allowable hygiene standards and smoke has greatly reduced the safety of visible tunnels and comfort in the tunnels. Therefore, the tunnel