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Microbiology: Do negative ions kill fungi, bacteria, viruses and dust mites? How effective are these  devices?
Are there any potential side effects of using negative ion devices?
Negative ion generators are generally considered safe to use, and there have been no reports of serious adverse effects associated with their use. However, some people may experience mild symptoms such as headache, dizziness or nausea when exposed to high levels of negative ions, and caution should be exercised when using them in high concentrations or for extended periods of time.