I put it in my bedroom and now the room always smells like.. new air? Not sure how to describe it. It definitely doesn't smell like *nothing*, but it's not a bad smell, at least I don't think so. On Fridays before I go to work I put the ionizer on for like 45 minutes while I leave the room, then turn it off before I leave so the ozone can break down into oxygen. Seems to suck up all the dust as the sensor turns blue for awhile. My room is very dusty so anything helps, really. I just enjoy that 1.) the ionizer is optional and 2.) the dark cherry wood cover I chose matches my furniture. Nice purchase.