在政府的网页上找到一个listhttp://www.haze.gov.sg/haze-update/Portable-Air-Cleaners.aspx The listed air cleaners will be able to provide adequate protection to a typical HDB bedroom with its doors and windows closed, except for occasional opening and closing of doors. Doors and windows should be opened up occasionally, or at least once a day, to ventilate the room. http://www.haze.gov.sg/haze-update/List-of-Portable-Air-Cleaners-and-Suppliers.aspx