... sterilizating, deodorizating, dust removing,purifying odours, bacteria and other contaminants well,as following:Sterilization:Quick killing ... rapid decomposition air formaldehyde, benzene, ammonia, radon and the harmful gas of carbon dioxide.Purification: refining ... many negative ions, and renewable factor, producing fresh oxygen,and purify airAdding humidity: Releasing anion and water molecules, ...