Here is a smart air purifier that gets rid of 99.999% of nano-sized particulate matter down to 0.01 micrometers. The Coway Airmega 250S can cover 930 sq.ft spaces. It comes with 7 fan modes and has a noise level of 22-54dB. With the companion app, you can monitor air quality, change fan speed, and keep up with filter notifications.
This air purifier is compatible with Alexa. It has a LED bar to show how dirty your air is. It has sleep and eco mode too.