The Dyson Pure Hot+Cool removes gases and 99.95% of allergens and pollutants from the air1, acting as a purifying heater in winter, and purifying fan in summer. It captures ultrafine particles from the air including pollen, bacteria and pet dander right down to 0.1 microns.2 A dense layer of tris-impregnated carbon crystals captures gases, odours and domestic fumes to circulate purified air throughout the room.