The contamination in the central air conditioning duct system is the one of the principal contamination of the indoor air, it include inhalable particle and microorganism.
中央空调通风系统送风中的污染物是室内空气的主要污染源之一，主要的污染物是可吸入颗粒物和微生物。
2
Under the intrude of the wastewater and particle power and mine gangue, the soil was suffered different level contamination, which did harm to agro-ecosystem and man health.