Material: Nanometer TiO2, UV Light, Active Carbon, Ionizer, etc. Decomposing: Formaldehyde, Benzol, Ethane, Acetone, Xylene, Carbon, Monoxide, Ammonia, Radium, Thorium, Kalium, Sulfureted hydrogen, etc. Purging: Germ, Pathogen, Microorganisms, Irritative odors, Farina, Dust, Smoke, etc. Generating: Negative ion.