Recently, indoor air pollution by chemical substances generated from building materials, furniture and various utensils becomes a serious problem in Japan. Such indoor air pollution may be a cause of hazardous influence onto the occupants' health ("Sick-House-Syndrome"). In this study, indoor air quality of houses in Miyagi prefecture, Japan, where occupants are suspected of Sick-House-Syndrome, has been investigated during the summer in 2001. The investigation includes measurements of aldehydes and Volatile organic compounds (VOCs), questionnaire regarding subjective symptoms, examination and clinical test by medical doctors. As a result, the relationship between chemical substance concentration and the subjective symptoms by questionnaire suggested that the symptoms of the occupants become stronger in higher concentration houses, and, on the other hand, there are some occupants with heavy symptoms in low concentration houses.
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