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柴油机工作时的排放主要是炭粒、重碳氢化物、硫酸盐、油气、水气及灰分等可见物和一氧化碳、氮氧化合物、二氧化硫和碳氢化合物等有害气体。这些排放物不仅会对环境造成污染,而且会造成能源的浪费。控制重点是氮氧化物和颗粒污染物。据调查,全国机动车排放的污染物中,由柴油车造成的占氦氧化物的43％,占颗粒悬浮物的83％。
Diesel emissions are mainly carbon particles, heavy hydrocarbons, sulfates, hydrocarbons, moisture and ash and other visible substances and carbon monoxide, nitrogen oxides, sulfur dioxide and hydrocarbons and other harmful gases. These emissions not only pollute the environment but also result in energy waste. Control focuses on nitrogen oxides and particulate contaminants. According to the survey, of the pollutants emitted by motor vehicles nationwide, 43% of the helium oxide accounted for by diesel vehicles and 83% of the suspended particulates.