STUDIES ON GUIDELINES TO KEEP HEALTHY DAILY LIFE FROM INJURIES CAUSED BY INDOOR AIR POLLUTANTS

本研究的目的是为编制室内空气质素指引提供有用资料，以维持舒适及健康的室内空气质素。采用被动抽样方法，对东京周边约100户家庭的室内空气污染物进行了检测。结果掌握了污染物的特征：夏季高温高湿导致甲醛浓度升高。然而，大多数浓度被观察到低于室内空气质量标准80 ppb。新建和改造后的房屋甲醛释放量较高，但三年后会大幅下降。因为在室内使用煤气炉、煤油炉等没有烟囱的取暖设施，燃烧煤气，所以在冬季二氧化氮含量很高。有时，浓度超出空气质量标准4到6倍。夏季氨浓度普遍偏高，可能与环境温度有关。而且，他们在一个有家猫的房子里度过了非常high的一年。真菌数量夏季多，冬季少。这一趋势源于季节湿度的变化。枝孢菌和青霉菌是室内环境中最常见的真菌种类。因此，本研究的结果将为制定室内空气质量指导方针提供重要信息，以确保我们的日常健康生活。

The aim of this study is to obtain the useful information for compilation of the guidelines to keep the comfortable and healthy indoor air quality. Indoor air pollutants in living rooms in about 100 families in around Tokyo were examined based on a passive sampling methodology. As a result, the characteristics of the pollutants were grasped as follows : Concentration of formaldehyde was raised in summer due to high temperature and humidity. However, most of the concentrations were observed to be less than 80 ppb of indoor air quality standard. Newly built and reformed houses would release high level formaldehyde but it would be greatly decreased in three years. Nitrogen dioxide was found at a high level in winter because heating facilities without stack such as gas and kerosene stoves were used to emit burned gas indoors. Occasionally, the concentrations ranged more than air quality standard by a factor of 4 to 6. Ammonia concentrations were generally high in summer which may be related to the ambient temperature. Moreover, they were very high in a house with domestic cats through a year. Fungi amount was high in summer and low in winter. This trend would be derived from the seasonal humidity variation. Cladosporium, and Penicillium were observed to be the most popular fungus species in indoor environment. It is concluded that these findings in this study will be important information to compile the guidelines to secure our healthy daily lives from the standpoint of indoor air quality.