This air purifier lets you feel better knowing that your family is breathing cleaner air. True HEPA filtration system removes up to 99.97 percent of airborne allergens as small as 0.3 microns. These allergens include ragweed pollen, grass pollen, tree pollen, household dust, dust mite debris, mold spores, pet dander and smoke. Digital display with timer lets you easily adjust the four speed settings. Carbon odor filter helps fight common household odors and has been treated with Arm and Hammer baking soda. This allows the air purifier to trap larger particles as well as absorb and eliminate odors that may come from pets, garbage, bathrooms, litter boxes, smoke and cooking.