I have super bad allergies when it gets really windy and dusty, so I bought this to try to clear out some of the dust particles and also the pollen that are in the air. I have this in my bedroom because it is not a very big unit and does not purify large rooms really well, it works better for something smaller like a single bedroom. I really like this unit and it works really well to get rid of all of the dust and pollen out of my room, I get instant relief when I go in there when I am having problems breathing anywhere else in the house. The only thing I have to complain about is it is hard to find the filters anywhere for it other than online, so it is important to try to keep an extra few on hand all the time for when you have to change it. It is small and fits nicely on top of a dresser or anywhere in the room and it is very quiet and does not make a sound at all. We have never had a problem with it and have had it for four years and it still works just as well as it did when it was brand new.