This study aims to present the fundamental strategies for improving the Indoor Air Quality ( IAQ ) in newly unoccupied apartment units. The results of this study can be summarized as follows; The field survey of 160 newly unoccupied units with airtight doors and windows showed that the concentrations of HCHO and TVOC were higher than the standards. The emission rates of HCHO and TVOC were proportional to the height. The small chamber test of pollutant concentration for building materials showed that pollutants were emitted dominantly from the wood furnishings and adhesives. Keywords : Newly Unoccupied Apartment Units, Sick House Syndrome, HCHO, VOCs, TVOC, Building Interior Materials