negative ion is from electric corona discharge from lightning & cosmic rays or by Ozone Generator Negative Ion Purifier
https://guardianlv.com/2020/03/can-negative-ions-combat-the-coronavirus/
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negative ion is from electric corona discharge from lightning & cosmic rays or by Ozone Generator Negative Ion Purifier
https://guardianlv.com/2020/03/can-negative-ions-combat-the-coronavirus/