The Holmes Mini Tower Air Purifier with True HEPA filter captures particles as small as 0.3 microns and operates quietly to remove up to 99.97% of airborne particles passing through a filter such as pollen, dust, mold, pet dander, and smoke, providing relief from odor and irritants in the air so you can breathe comfortably. The optional ionizer ensures particles are more easily captured while also tackling odors. This space-saving air purifier has a slim design and is deal for bedrooms, dorms, and offices.