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How long do ions typically last?

The half-life of an air ion is dependent on its size and mobility. Negative ions tend to be smaller with half-lives of several minutes in dry, clean outdoor air while positive ions are larger and have half-lives of about 30 minutes. When indoors, the life of an ion is much shorter because of the increased probability of the ion shorting to ground by contacting a wall or surface. Therefore, in a confined space ions may only “live” for about 30 seconds. (source)

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