公共汽车内空气中细菌污染的调查

Survey of the bacterium of air pollution in buses

在市区范围 ,选择某一条线路公共汽车 ,调查其运行途中空气污染细菌的现状 ,结果发现 :A11月 (冬季 )污染细菌的浓度最高 (2 345 5个 /m3 ) ,比对照高出 2 5倍 ,A17月 (夏季 )细菌污染浓度有所下降 ,5 6 85个 /m3 ,比对照只高出 7 5倍。因此人口密集 (5人 /m2 )、空气不流通是造成空气污染的主要原因。

The author chooses a certain bus route on the range of urban district,and then i nvestigates its current situations of the bacterium of air pollution.The survey shows that the density of bacterium gets top level(23455 pieces/m 3)in January( winter).It is 25 times higher in group than that of contrast.It decreases(5685 p ieces/m 3)in July(Summer),only 7 5 times higher than that of the contrast grou p.So we make a conclusion that bad ventilation is the main reason causing the ai r pollution in a densely populated area(5 people/m 2).