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Dyson purifiers have intelligent sensing. Three sensors work in harmony to constantly monitor your air quality — interacting with Dyson’s unique algorithm to diagnose and report pollutants in real-time. This design also has two layers of purification to thoroughly clean your air. HEPA H13 and activated carbon filtration captures gases* and 99.97% of pollutants as small as 0.3 microns. And the whole purifier, not just the filtration system, is fully sealed — so what goes inside, stays inside. Dyson purifiers have Air Multiplier technology, to purify the whole room.** It generates powerful circulation, drawing pollutants from every corner into the filters and projecting purified air throughout the room. * Gas capture rates vary. ** Tested for air projection (DTM801), purification coverage in a 2860ft³ room (TM-003711).