What are the benefits of negative ions in the air to human health?

The air also contains negative ions that are very beneficial to human health. The reason why people feel relaxed and linger every time they go to beautiful mountains or under high waterfalls, or by warm and humid streams, and feel that the air is particularly fresh is because the air in these places is rich in negative ions. Negative ions are produced by ultraviolet rays and cosmic rays during plant respiration. The number of anions is also influenced by geographical conditions and meteorology (wind, snow, rain, humidity, clouds, etc.). ) and season. According to the measurement, the content of negative ions in outdoor air is higher than that in indoor air. Rural areas are higher than cities; The mountain is higher than the mountain; Seaside is higher than inland, sunny day is higher than cloudy day, morning is higher than afternoon, summer is higher than winter. The lifetime of negative ions is only a few minutes in clean air and only a few seconds in dusty places. They are constantly disappearing and emerging. Modern research has proved that charged anions are very beneficial to human health, so they are known as "air vitamins". Negative ions can regulate the function of cerebral cortex, invigorate the spirit, eliminate fatigue and improve work efficiency; Can calm, hypnotize and lower blood pressure; When negative ions enter the respiratory tract, the bronchus relaxes smoothly and relieves its spasm, so it has the effect of relieving cough and asthma; Negative ions can strengthen the oxidation process of kidney, liver, brain, adrenal gland and other tissues, increase basal metabolic rate, promote epithelial hyperplasia, increase the body's self-repair ability, improve the body's immunity and accelerate wound healing; Negative ions can improve the function of reticuloendothelial system, promote the synthesis and storage of vitamins in vivo, promote protein metabolism, and reduce the level of 5- hydroxytryptamine in blood. Anions can also inhibit and kill bacteria. High concentration of negative air ions can reduce the mortality of viral diseases. Through a large number of studies, it is considered that 1 0 ~100000 negative ions per1cubic centimeter can prevent and treat diseases.