Abstract
Indoor air qualities of twenty-two houses in Sendai, where occupants are suspected suffering from so-called, "Sick-House-Syndrome", were investigated. The investigation included measurements of formaldehyde and VOC concentrations, questionnaire regarding subjective symptoms, and medical test of MCS by doctors. IAQ in some houses exceed the guideline set by the Ministry of Health, Labour and Welfare of Japan. The relationship between the measurement result of indoor chemical substance concentrations and the subjective symptoms by questionnaire suggested that the symptoms gets more serious in houses having higher concentration and, on the other hand, there are some occupants with heavy symptoms in low concentration houses.
