This is the perfect size to use in a small room. The package states that it kills 99.9% of germs, virus and bacteria, though I don't know how to truly measure that. I do have pets and it definitely has made a definite difference in the odor in my home. It’s small enough to move from room to room. It’s pretty quiet. I have a larger air purifier that I had been using, but this Aaira one is definitely better