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随着汽车工业的发展,汽车保有量逐年增加,汽车排放物对大气的污染日益成为巨大的威胁,影响着生物的生长及人类的健康。以一辆技术状况完好的小客车为例,当没有采用排放控制装置时,其每天排出的污染物(CO,HC,NOx和微粒)大约为0.567公斤,当汽车调整不良和技术状况恶化时,其排放的污染物质就更多。美国70年排放到大气中的污染物约为3.3～3.5亿吨,其中2亿吨来自汽车排放物,约占60%,在日本占50%。在这些工业发达的国家中,都曾多次发生光化学烟雾中毒事件。因此,汽车排气污染问题日益引起人们的重视,各国社会舆论对防止空气污染的呼声日益强烈,各工业
With the development of the automobile industry, the car ownership has been increasing year by year. The emission of car emissions to the atmosphere has become a huge threat day by day, affecting the growth of organisms and human health. Taking a small passenger car in good condition as an example, the daily discharge of pollutants (CO, HC, NOx and particulates) is about 0.567 kg when the emission control device is not used. When the car is not properly adjusted and the technical conditions are deteriorating, It emits more pollutants. The 70-year pollutants released to the atmosphere by the United States are estimated at between 330 and 350 million tons of pollutants, of which 200 million tons come from car emissions, about 60% and 50% in Japan. In these industrially developed countries, there have been many episodes of photochemical smog. Therefore, the issue of automobile exhaust pollution is drawing people’s attention day by day, and the voices of public opinion in various countries on preventing air pollution have been increasingly strong. Various industries