This study investigated the effect of absorptive building materials in decreasing indoor concentration of formaldehyde by numerical simulation. Many studies have been reported on this subject, but most were limited to the investigation of one room. In this study, the numerical analysis models were based on the standard house of AIJ (Architectural Institute of Japan) to study the building material in full-size house. The performances of absorptive materials were compared by changing the surface area and position, and the most effective arrangement was studied. The case that absorptive materials were placed on the whole walls showed large effect of decreasing pollutant concentration compared to that without absorptive materials. It is also shown that installing absorptive building materials in the room with high formaldehyde oncentration is most effective. It can be concluded that the performance of decreasing formaldehyde is not determined by absorptive surface area proportionally and the layout of the absorptive materials is also important to achieve better effect.
