Chlorine dioxide has double oxidation effect, can adsorb and penetrate biological surface into its interior, effectively destroy its enzyme system, resulting in the death of pathogenic bacteria such as microorganisms due to metabolic dysfunction. The air contains a large number of pathogenic bacteria, especially in crowded public places, with a large number and complexity of microorganisms. Chlorine dioxide sterilization boxes, sterilization cards and sterilization sachets can effectively kill pathogenic microorganisms in the air by releasing chlorine dioxide gas as an effective component, and can also eliminate peculiar smell and refresh the air. Therefore, chlorine dioxide is an ideal environmental disinfectant.