Abstract
Measurement of three houses was conducted in the summer and the winter of 2003. According to a series of survey from 2001, in conclusion, 1) materials used in daily life as well as building materials led to the emission of formaldehyde and VOCs in houses. 2) sick house problem in cold area would be serious not only in well-insulated and airtight houses but also in ordinary houses. 3) it was found to influence for air tightness performance and residents* lifestyle (e.g., opening windows in summer, closing windows in winter and usage of ventilation system) on IAQ.
