Filters out at least 99.97% of fine airborne particles through the H13 HEPA filter, active carbon filter, and pre-filter – no air pollutants bypass the 3-layer filter. The air purifier captures airborne pollutants from coarse impurities like pet dander and fur, to 0.3-micron particles like pollen and mold spores. Designed as a replacement filter for TaoTronics TT-AP006 air purifier (sold separately). Easy to Replace; no tools required.