by 
The Curious Bag
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<h4 class="dechead">On One Hand: They Are Not Safe
According to Consumer Reports magazine, ionic air purifiers release potentially unhealthy levels of ozone. The medical staff of both Consumers Union and Consumer Reports warns against ionic air cleaners. Even brief exposure to ozone levels aggravates asthma, and can hurt lungs.
On the Other: They Do Not Work Well
Ionic air purifiers do not improve air quality, according to Dr. James Sublett, clinical professor at the University of Louisville. He does not recommend ionic air purifiers because they do not effectively remove dust, dander and other irritants from the room.
Bottom Line
Air purifiers that do clean the air in the room, such as high-efficiency particulate air (HEPA) filters, are available. Ionic air purifiers are not recommended, because some produce unhealthy amounts of ozone levels, and they do not do a good job of cleaning the room.
Source:
HealthandEnergy.com: Consumer Reports calls air purifier "unhealthy"
Los Angeles Times: Ionic air purifiers' dirty little secret: They don't get rid of dust
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