排水系统导致室内环境的隐性污染一直被忽视。在城镇化快速发展的过程中,为了节约土地,高层住宅的比例越来越高,高密度的居住人口,大大增加了建筑内部排水系统的压力,排水系统返臭气已经成为普遍现象,而返臭气意味着室内环境与排水系统内的污染环境相连通,臭气中所含的气态污染 Drainage system lead to the indoor environment of the hidden pollution has been neglected. In the process of rapid urbanization, in order to save land, the proportion of high-rise residences is getting higher and higher. The high-density residential population has greatly increased the pressure on the drainage system inside the building. Return odor has become a common phenomenon in drainage systems, Odor means that the indoor environment and the drainage system connected to the contaminated environment, odor contained in the gaseous pollution