I bought this for 2 reasons. I had cigarette odor coming from 1 apt and chemical odors from another apt doing acrylic nails into my unit. I originally bought a traditional large room HEPA air purifier with charcoal filter. It worked on the cigarette odor but not on the chemical smell. I ordered this one which has a hydroxyl generator also known as its plasmawave. I can honestly say it took the chemical odors down to the point where I no longer smell them in my apt. If I went outside and came back, I could faintly smell them but after a few minutes, it wasnt noticeable. No more nose burning. Precious relief. This did rid my unit of cigarette odor fully. I also clean the screen weekly because it will be covered in cat hair. It grabs that to. The carbon section is also rinseable.  I now have 2 of them.