The purpose of this investigation is to know the present status of indoor air chemical pollution byVOCs in Japanese houses. The concentrations of formaldehyde, toluene, xylene, ethyl-benzene,styrene and acetaldehyde were measured in ten thousand built houses from 2000 to 2005. And thefollowing results were obtained. In 2000, the indoor concentrations of formaldehyde exceeded theguideline established by the Ministry of Health, Labor and Welfare of Japanese Government at thepercentage of 27%. And In the case of toluene the percentage was 12 %.
The purpose of this investigation is to know the long term characteristics of VOC concentrations inhouses built before the building code in 2003 and to know the need of the countermeasures in thehouses were already built for example the improvement of the living habit, ventilation and buildingmaterials. The concentrations of VOCs were measured in these houses from 2000 to 2005. The resultsshowed that the concentration of formaldehyde decreased in the first year. After that the decline of theconcentration became invisible and the concentration changed only with the temperature.
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