Ideal for springtime and allergy season; helps get rid of common allergy triggers including dust mites, pollen, mold, pet dander, as well as other small particles and pollutants 3 Stage Filtration System: Pre-filter, TRUE HEPA Filter, & Activated Carbon Filter. It removes 99.97% of dust, pollen, smoke, odor, mold spores, and pet dander; filters particles as small as 0.3 microns and larger and filters air pollution of PM 2.5. Good for stuffy nose 100% Ozone free, does not use UV or Ions which produce trace amounts of measurable ozone, a harmful air pollutant Smart auto mode to indicate the surrounding air quality, automatically suggests fan speed to purify your air faster Sleep mode sets the purifier to its lowest setting to produce fresh air as you soundly slumber without disturbing noise