Instruct: Classify a given Amazon review as either positive or negative.
Query: Ahhhhh!!

I noticed a difference right away! I have a small studio apartment and once I plugged this into the wall, my air was really clean within hours. I noticed a huge difference with my allergies. I also have a cat so the usual 'cat smell' that can linger was gone. I have friends that are severly allergic to cats, so I tested it out with them. I had the machine on high for about two hours, then invited them over. They had no symptoms in the 3 hours they were there! I definitely recommend this product to anyone that has allergies, or just wishes to breath cleaner, fresher air!