The Dyson Pure Cool Link Air Purifier has been designed to automatically purify air and remove 99.97% of allergens and pollutants as small as 0.3 microns. In auto mode, your purifier will automatically monitor indoor air quality, and adjust airflow accordingly. So once the air in your room is clean, it stays clean. If it’s hot, you might need personal cooling and purified air throughout the room. But there's no need for two machines - your purifier’s more powerful settings will generate smooth, long-range airflow to cool you. You can easily monitor your indoor air quality and see live air quality metrics – straight from your Dyson Link app. With the help of the automatic night-time mode, your purifier will continue to monitor and respond to air quality at the push of a button while you’re asleep – but only using the quietest settings.