Most of the houses are protected against this pollution, however, so Doucette and his team suspected something else was causing the problem.
所以,多赛特和他的团队怀疑是别的原因导致了室内空气的污染。
In their study of the Christmas ornaments, Doucette and his colleagues found that just one gingerbread man ornament raised the DCA levels in a house to unsafe levels.