I have two cats and no matter how clean I keep the area, there's still a slight smell. Once I plugged in and turned on the shark air purifier, and in about an hour I could smell the difference. I love the automatic option too! Doesn't take up a lot of space either. The only problem at this point is trying to get replacement filters. Hopefully I'll be able to continue to use this air purifier because other than the replacement issue, I love it!