I use this specifically to help keep the air fresh around my cats litter box. My husband is extremely sensitive to the smell of cat urine. After placing this near the litter box he has barely acknowledged the litter box at all, which means this amazing machine is doing a fantastic job of cleaning the air around it. It’s also a nice small size and not nearly as loud as some others I have used. Definitely recommend this for cleaning the air in a small location. I can’t vouch for it’s efficiency in a large room.