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在城市污染因素中95％是由机动车造成的,而摩托车则占注册机动车的70％。机动车总HC排放中,有61％是由摩托车产生的。其CO排放中,有38％是由摩托车产生的;在摩托车中,二冲程摩托车则占70％。二冲程摩托车的HC、CO排放和烟度则
Ninety-five percent of urban pollution is caused by motor vehicles, while motorcycles account for 70% of registered motor vehicles. 61% of the total HC emissions from motor vehicles are generated by motorcycles. 38% of its CO emissions are generated by motorcycles; two-stroke motorcycles account for 70% of motorcycles. Two-stroke motorcycle HC, CO emissions and smoke then