Abstract
The purpose of this research is to know the present status of the indoor air VOC pollution in Japanese houses. From the measured indoor concentrations and the questionnaire results from five thousand householders, the following results were obtained. 1. In 12.3% of the houses, the concentrations of toluene exceeded the guideline established by the Ministry of Health, Labor and Welfare of Japanese Government. And those of xylene and ethyl-benzene were 0.13% and 0%. 2. The concentrations in houses with ventilation systems were the same as those in houses without ventilation systems. 3. The structure types, the number of floors and the regions are considered as the main factors of concentrations.
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