Sometimes the things that cause the most harm are the ones that we cannot even see. Dyson air purifiers are scientifically tested to capture harmful ultra-fine particles as small as allergens, bacteria and viruses. They automatically sense and capture these pollutants, and oscillate 350° to project purified air around the whole room properly. Certified asthma and allergy friendly | Quietmark certified | WiFi, App enabled | Works with Alexa | Dyson