The Philips Air Purifier Series 2000 has 3-layer filtration with NanoProtect HEPA, active carbon filter and pre-filter captures 99.9% of ultra-fine particles as small as 0.003 microns, so you are safe from PM2.5, bacteria, pollen, dust, pet dander, gas and other pollutants. Certified by the European Centre for Allergy Research Foundation.See the real-time air quality in your home at a glance. The display shows the level of allergens and PM2.5 in numerical form, as well as with an intuitive color ring.Run your product in intelligent automatic mode or choose from 3x speed levels: Sleep, Speed 1 and Turbo – to be fully in control of the airflow and sound level.