Philips unique SelectFilter Plus filtration technology quickly and effectively removes harmful microbes (such as viruses and bacteria) and ultrafine particles as small as 0.015µm* detected in the car cabin, such as PM2.5. With a Clean Air Delivery Rate (CADR) of 16 m3/hour for PM2.5, 50% of a standard sedan or SUV is filtered in less than 10 minutes. Not only does it remove harmful particles, but also cigarette smoke and dust so that you breathe fresh and clean air.