I bought this purifier after returning a purifier from different company,because I am chemically sensitive and the off gassing bothered me. So, My husband called Arlen and questioned them extensively about this purifier. They customer service rep knew his stuff, and knew about chemical sensitivity. He suggested this purifier without a carbon filter. He told my husband that the material is high grade plastic and does not off gas. Well, we bought it. And it is awesome. There was a very faint smell for about one week. (My husband didnt smell a thing, but I have a super sensitive nose and smell everything) Now, it smells like perfect pure air, and I love it. I am thrilled. I am the pickiest and fussiest consumer, and I give it an A+!