The Shark Air Purifier uses Pure Air MicroForce to deliver fast, powerful, and quiet purification in a compact size. Clean Sense IQ automatically improves your air quality and reports results in real time. A HEPA filter captures 99.98% of airborne particles like allergens, dust, and dander. Based on IEST-RP-CC007, 0.1-0.2 microns. Allergens refers to non-living matter.