Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Unable to use

Yes, this is very quiet. Yes, it doesn't take up much space.This wasn't on for more than 2 days before the ionizer, producing negative ions, within the filters bothered me so much that I had to return it. My nose, eyes, throat, and eventually chest burned after only 5 minutes, then 3, then less than that. When I called the company, the rep said I must be especially sensitive to the ions released. They gave me a return number and I sent it back for a refund, which I received.I bought this because it was a "low producer" of ions. These ions will harm you if in sufficient quantities. The purifier was as far away from me as possible, at the outer range of square feet specified in the advertisement.