Captures dust, allergens and bacteria. Even destroys formaldehyde. Captures 99.95% of pollutants as small as 0.1 microns. It combines a precise solid-state formaldehyde sensor with a unique catalytic filter that continuously destroys formaldehyde. HEPA H13 and activated carbon filters also capture dust, allergens, gases and other ultrafine pollutants. And Dyson purifiers have powerful Air Multiplier™ technology to purify the whole room.