Allergens, germs and odors—oh my! GermGuardian’s AC5900WCA HEPA Filter Air Purifier is the clear solution for removing impurities from air. The HEPA air filter reduces up to 99.97% of dust and allergens while the pre-filter traps large particles like pet hair. An activated charcoal filter keeps the room smelling fresh, helping remove household odors and gasses emitted from cleaning products and other pollutants. You can also give the room a cleaning boost with the optional UV-C light technology setting that can help kill airborne germs and viruses. This air purifier works for you with an automated air quality control monitor, three speed settings, UV-C light control and timer function.