Relation between heat islands and NO2 pollution in some Japanese cities

Takao Gotoh
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引用次数: 21

Abstract

In Japanese urban areas, NOx air pollution has recently become more and more serious, and a rise in atmospheric temperature has been observed. This correlation was surveyed in 187 locations, where NO2 concentration monitoring and atmospheric temperature measurement were conducted simultaneously and separately during the same period from 1982 to 1988. The following results were obtained. First, the percentage of areas where NO2 concentration increased was 72%. Second, the percentage of areas where the correlation coefficient between the annual mean NO2 concentration and the elapsed years was larger than 0.20, and at the same time the correlaltion coefficient between the annual mean NO2 concentration and the annual mean atmospheric temperature was larger than 0.20, was 23%. About three-quarters of these areas were in the Tokyo and Osaka megalopolis. Third, in these areas, the relation between the mean NO2 concentration and the regression coefficient of the change in atmospheric temperature relative to the change of annual mean NO2 concentration was suspected to be distributed steeply with a reflected point in NO2 concentration.

日本部分城市热岛与NO2污染的关系
在日本城市地区,氮氧化物空气污染近年来越来越严重,大气温度有所上升。在1982 - 1988年的同一时期,对187个地点的NO2浓度监测和大气温度测量同时或分别进行了调查。得到了以下结果:第一,NO2浓度增加的地区占72%。②年平均NO2浓度与历年相关系数大于0.20,同时年平均NO2浓度与年平均气温相关系数大于0.20的地区占23%;这些地区中约有四分之三位于东京和大阪大都市。第三,在这些地区,平均NO2浓度与大气温度变化相对于年平均NO2浓度变化的回归系数之间的关系可能分布较陡,并在NO2浓度上有一个反映点。
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