Create an action by chlorine dioxide gas to purify the surrounding environment safe for people with low density up to require a long period of time . Chlorine dioxide gas processing structure for reducing the chlorine dioxide gas in the air to be treated , including the chlorine dioxide gas (20 ), and the target air space and which is equipped with a circulation fan 23 and the contact layer and the ultraviolet light irradiation means , the contact layer the steel of the wire will moistened with water on the steel wool (21) united with cotton shape , fan 23 circulates air within the space to be processed by the ultraviolet light irradiation means (24) to the contact layer in the return path in a state in which the target air is irradiated with ultraviolet rays is brought into contact with the contact layer . ;
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