Medical research hasshown that when there are more than 20,000 negative oxygen ions per cm³ of air, there is a therapeuticeffect. Professor Li Anbo from Xi'an Medical University, Professor Chen Tingrenfrom the Third Military Medical University, and scholars from the JapaneseSociety of Ion Medicine, after reviewing a large number of relevant domesticand foreign literatures, made a summary: In the high concentration negative ionenvironment, the human body also obtained health.

In addition, it hasbeen verified from the current clinical medical research that the use ofclose-range inhalation at a concentration of 10 million cubic centimeters hasnot adversely affected the human body through long-term observation.