Consists of a True HEPA filter and an activated carbon filter. Filters 99.97% of pollutants, even those as small as 0.3 μm. Filters dust, dust mites, mold spores, pollen, allergens (including from pets), smoke, airborne particles PM2.5 and PM10, and VOCs (volatile organic compounds). Neutralizes odors from cigarettes, cooking, and pets. Filter replacement is recommended every 12 months or when the filter change indicator lights up.