Some air purifiers can connect to Wi-Fi or Bluetooth and allow you to operate them through a smartphone app. This allows you to change the schedule or fan speed, as well as see real-time feedback on the air quality and allow for closer monitoring. This is often coupled with graphs or charts that make it easy to see how pure the air is or even what kind of pollutants the purifier is removing. The best part of a smart air purifier is that you can see, in real time, the difference the machine is making.