I live in a RV with my cat full-time. We recently have been having severe allergic reactions to the air. It is one thing for me to experience red eyes, scratchy throat, and labored breathing, but it is another thing to see my fur babies eyes swollen shut because of something in the air that we can't see or identify. I bought the Pure Zone 3-in-1 True HEPA Air Purifier, set it up on the 'high level' and within a few hours I wasn't reacting to the air. Long story short, my cat and I had one of the best night sleeps and woke up without any allergy symptoms. Something I didn't know was possible. And the air quality has stayed 'pure' and healthy.