Sick-house syndrome is caused by various types of chemical substances releasing from the building materials, and the airtight structure amplifies its disease. It is known that foliage plants has purification ability for emitted chemicals in an indoor environment. In this paper, purification process of Golden pothos for formaldehyde and emission process of formaldehyde from a piece of plywood in a chamber are measured using a tin oxide gas sensor. In the experiment, a number of potted plants that was put together with the plywood, was changed from 0 to 3. As for the results, the purification ability of a potted plant became obvious and it was recognized that the plants could purify continuously. The characteristics were analyzed and could be estimated by constructing a generating model. In the model, the purification characteristics can be predicted, when over four potted plants are installed in the chamber.
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