内燃机的气体燃料是指沼气、煤气、氢气、液化石油气和天然气等可燃气体。燃用气体燃料的内燃机,有人称“瓦斯发动机”。大气污染主要是烧油的内燃机排出的废气造成的。有些国家的城市汽车过多成灾,大气污染严重。根据环境保护资料分析,重点工业城市和闹市区上空,有害物质不断增加,主要是汽车排放的尾气造成的。 Gas fuel for internal combustion engines refers to combustible gases such as biogas, coal gas, hydrogen gas, liquefied petroleum gas and natural gas. Gas-fired internal combustion engines, some people call “gas engine.” Air pollution is mainly caused by the exhaust gas discharged from internal combustion engines that burn oil. In some countries, excessive urban traffic has caused serious air pollution. According to environmental protection data analysis, key industrial cities and downtown areas, increasing the harmful substances, mainly caused by vehicle exhaust emissions.