My PM2.5 readings are almost constantly close to 0, why?

This is the expected behavior if the air is clean, so be reassured that the purifier is doing a good job!

How to check that the sensor is reacting correctly?

  • Turn the fan off and apply some dust close to the sensor (by shaking dusty cloth next to the unit). You should see a peak in PM values after this action.
  • If nothing happens, try vacuum cleaning the sensor module filter and test again.
  • If you need any help, do not hesitate to contact the place where you bought the unit or Blueair directly.