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For our mini USB air purifiers, when it works, a high-concentration of negative ions will be generated and released into the air. As you know, negative ions has health care effect on human body. Also it can effectively absorb smoke and dust in the air, then sink to the ground to make the air fresh. In addition, when the anions are generated and released, also accompanied slight ozone(O3) produced. Ozone(O3) can kill the bacteria and remove bad smell, but the slight density wouldn't effect the human's body.
USB Air Purifier and 4 ports USB 2.0 Hub connected to Notebook
Colour Gift Box with USB Hub and Air Purifier