In order to grasp the movement of styrene, which is thought to be an endocrine disruptor, its emission rate was measured at every stage of the process in which an apartment house is constructed, and the emission rate from 'tatami' mats using polystyrene boards in a large chamber was also measured. As a result, the followings are made clear. 1. The emission rate of styrene becomes high after the installation of the wall panels and after the completion of the building. The emission rate at the completion reaches55 (mg/h) and its concentration is 1.4 (mg/m3) when the air change rate is 0.5(1/h). 2. The emission rate of styrene increases with dynamic loads by walking. The increase continues for six days at the shortest. From the above-mentioned results, the risk of indoor air pollution by styrene from 'tatami' mats using polystyrene boards is suggested.
