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What’s an ion?

Air ions are formed when a molecule gains enough energy to become ionized. In nature, sources of energy that can cause this to occur include background radiation, ultraviolet light, cosmic radiation, atomization of water, movement of large masses of air and lightning. Normal, fair-weather air ion concentrations range from 200 to 800 negative and 250 to 1500 positive ions/cm3. An approaching storm can increase the positive air ion concentration to over 5,000 ions/cm3! (source)

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