Negative oxygen ions, also known as "air vitamins", are an important standard to measure whether the air is fresh or not. The World Health Organization defines fresh air as the concentration of negative oxygen ions reaching 1000- 1500 /cm? .
Experts said that the higher the concentration of negative oxygen ions, the more obvious its effect on human health care and disease prevention. Experimental research shows that the concentration of negative oxygen ions reaches 2000-5000 /cm? It can accelerate the movement of epithelial cilia of respiratory tract, accelerate the vibration frequency of dermal cilia, increase the oxygen content in blood and inhibit 5- hydroxytryptamine in blood; After negative oxygen ions enter the blood through the alveolar epithelial layer, they release charges, act on blood and colloidal proteins, cross the blood-brain barrier and enter cerebrospinal fluid, which directly affects the function of the central nervous system. It can calm menstruation, hypnotize, lower blood pressure, and treat asthma, bronchitis, scald, neurosis, coronary heart disease, etc.