I know it's cleaning the air in my home, because the air smells fresher, and there's less dust on the furniture. The PureZone 3-in-1 True HEPA Air Purifier is a 3-stage air purifier that uses UV light to filter out germs, viruses, bacteria, and fungi / HEPA filtration to capture 99.97% of dust, pollen, pet dander, smoke, mold spores, and household odors./ and a activated carbon filter to absorb formaldehyde and other noxious gases. It's a quiet, sleek looking, easy to operate air purifier with lighted touch-button controls, and simple to use settings (On/Off, 3 fan settings, On/Off UV light setting, and optional timer setting). The automatic timer setting shuts off the unit after 2, 4 or 8 hours of continuous operation.