Loess and bamboo charcoal are representing environmentally-friendly construction finishing materials, especially commonly used to control indoor air quality in houses or buildings. We tested those eco-materials, using a test body, in order to figure out how effectively VOCs like formaldehyde and benzene can be eliminated or adsorbed. As a result bamboo charcoal removed 81.1% of input formaldehyde, 93.8% of benzene meanwhile loess removed only 69.9% and56.6% of those, respectively. As charcoal composition became lower, the elimination efficiency tended to decrease more or less. The superior sorption capability of the charcoal seems to be attributed to its diverse pore structure-i.e., properly distributed macro-, meso-, and micro-pores for not only smaller molecules but also macromolecules.