The air quality is significantly improved in the room I placed this, moreso than my Germ Guardians I have throughout my home. The sensor is very sensitive, so my current air quality in the room is reflected quite accurately. Quiet yet powerful. I really appreciate the placement of the intake of air and outtake allowing me to place this against a wall but still bring in the air from the whole room. Unfortunately the Germ Guardians I purchased I take from the back so placing them against a wall like I would have liked renders it pointless. Very well thought out design. I am a very happy customer and have been recommending this item to multiple people.