I put this air purifier in my bedroom. I have a pretty small room, and with two of us sleeping in there , it tends to get quite stuffy and just lots of stale air. The hubby works around a lot of people so every time he coughs or sneezes I feel like I'm breathing in whatever he's brought home. After just 3 or 4 nights of using this product, not only does the air feel lighter, but we both sneeze way less! I am thoroughly impressed!