As someone who has made consumer hardware products, we couldn’t get anyone to read the quick start guide either 
The AQI description is there on page 7. That’s where I also found the location of the mystery laser sensor, and the distance required from the wall for it to scan properly.
Doesn’t explain HOW the laser sensor works, but I wouldn’t expect that in a QSG.
Now if we can get Wyze to enable a dimming option on the display without having to use night mode, and outside/inside AQI history longer than one day? Wyze vacuum, thermostat, scale, and door lock all have a year history included. Perhaps this hasn’t been a feature request yet…
