Air purifier helps remove up to 99 percent of airborne particles such as pollen, dust, mold, pet dander and smoke for effective relief from odors and irritants in the air. HEPA-type filter captures particles as small as 2 microns from air passing through the filter to let you breathe comfortably. Washable pre-filter helps capture larger particles while also extending the life of the HEPA-type filter. Included Aer1 filter features the power of Arm and Hammer Baking Soda for powerful odor elimination.