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The use of sorptive building materials on room surfaces seems effective for decreasing VOCs and aldehydes concentrations that have the possibility of affecting human health. Giving the construction materials themselves the property of reducing the concentration of indoor pollutants has been reported as simple and effective, because it is highly effective without requiring the operation of special equipment. In this study, we evaluated the effects of sorptive building materials with respect to decreasing acetaldehyde concentrations in air using a small test chamber. we examined how the concentration of chemical compounds, temperature, and relative humidity influenced the sorptive performance for acetaldehyde, which was well reproduced experimentally with the computational fluid dynamics (CFD) simulations. The experiments and CFD analysis show that sorptive building materials have a fairly strong effect of decreasing acetaldehyde concentrations in rooms, and that this effect can be expected in practical use.