Honeywell Enviracaire 50250 Air Purifier with Germ Reduction The 50250 True HEPA Allergen Remover air purifier removes at least 99.97 percent of common household particles as small as 0.3 microns from the air passing through it such as dust, pollen, mold spores, tobacco smoke, and pet dander. The carbon activated pre filter helps remove common household odors while helping to extend the life of the HEPA filter. The patented 360 degree air intake and discharge maximizes efficiency, circulating the air and allowing for placement in any area of your room. This air purifier also features the Intelli Check filter monitor to remind you when to replace the filter. Statistics are from the air that passes through the filter. Overall particle reduction is dependent on many factors, including the amount of air processed, the pollutant type, and the pollutants introduction rate into the environment.