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Using high-energy high ultraviolet light decomposition of ozone in the air molecules to produce free oxygen (reactive oxygen species). Because of free oxygen carries electron-positron unbalanced so need to combine with oxygen, which produce ozone. The ozone oxidation of organic matter with a strong, to the stench gas and other irritating odor have immediate removal effect. Nanometer photocatalyst TiO2 generate \"electronic holes\" (a kind of high energy particles) under stimulating by the light of specific wavelengths, which have strong ability of oxidation-reduction to the water and oxygen around them. Aldehydes, hydrocarbons and other pollutants in the air can be directly down into harmless and tasteless substance, and bacteria cell walls and bacteria can be destroyed, achieving the goal of eliminating air pollution.