The purpose of this study is to measure the ventilation rate, TVOC concentration and residents' behavior for air Conditioner use and window opening in occupied dwellings in Kagoshima City. Residents completed a questionnaire voting residents' behavior (i.e., when they opened windows, when they operated air conditioners, and so on) during the period of ventilation and temperature measurement. As a result of this measurement, it was found that there were considerable differences between TVOC concentration measured at night and that at daytime. While some residents operated air conditioners more often at night, other residents more in daytime. Therefore we calculated the time fluctuation of air conditioner use and the window opening for the two types of dwellings.
