The Sustainability of the Megacities Considered from the Comparative Urban-Climatological Point of View -- The Comparative Study of Tokyo and Mexico City --

从城市或生物气候学的角度考虑特大城市的可持续性，以东京和墨西哥城为例。调查项目包括：月最高、平均、最低气温及其年变化、平均偏差、平均相对湿度、夏季日、指定气候日、不适指数、二氧化氮、悬浮颗粒物等空气污染浓度等。20世纪60年代以后，城市对气温的影响得到了明显认识。城市化对冬季最低气温的影响最大，对秋季最高气温的影响最小。重要的是，每个人对相同的气候或相同的温度-湿度条件的感受并不相同。日本人在不舒服指数稍高的一侧感到舒服。东京有明显的四季，而墨西哥城有两个季节，即干季和湿季。

The sustainability of the megacities is considered form the urban- or bioclimatological point of view as examples of Tokyo and Mexico City. The items of investigation are as follows : monthly maximum, mean and minimum air temperatures, their annual change, their mean deviation, average relative humidity, summer day, the specified climatic day, discomfort index, air pollution concentration such as nitrogen dioxide, suspended particulate matter and so on. The urban effects are recognized on air temperature conspicuously after 1960's. In detail the effect of urbanization appears the most strongly on minimum air temperature of winter, whereas the least on maximum air temperature of autumn.It is very important that every people do not feel equally for the same climate or same temperature-humidity condition. Japanese people feel comfortable at a little bit higher side of discomfort index. In Tokyo there are distinguished four seasons, where as there are two seasons, that is dry and wet season in Mexico City.