Ions are the charges contained in molecules or atoms. These ions exist in nature. Simply speaking, small ions have a survival time of 30 to 300 seconds, but they are very active; and small ion densities range from 900 to 1,100. Negative ions and 1,000 ~ 1,200 positive ions per cubic centimeter (ion/cm3), in a "fresh air" environment, like the top of a mountain, at sea level we usually experience 500 negative ions and 600 positive ions per cubic centimeter [Ion/cm3], while in urban buildings, the ion level drops by 80% to 95%. In the small office, almost no ions are measured, and when the ions are reduced, the air quality is degraded.
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