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空气离子疗法据测定,不同地区所含的负离子的数目是不同的。在大城市的居住房间里,每立方厘米只有40个～50个负离子;城市街道空气中每立方厘米有100个～200个负离
Air ion therapy is measured, the number of negative ions contained in different regions is different. In a metropolitan living room, there are only 40 to 50 anions per cubic centimeter; there are 100 to 200 negative ions per cubic centimeter of air in a city street