WINIX 5500-2 Air Purifier is ready to reduces 99.97% bacteria, viruses, household odors to give you and your family the cleanest air. The true HEPA filter captures 99.97% of airborne pollutants; dust mites, pet dander, pollen and other allergens as small as 0.3 microns while the PlasmaWave Air Cleaning Technology creates Hydroxyls to neutralize bacteria and viruses. Also Read - LEVOIT Core