The Particulate Matter (PM) levels are often close to 0 / showing as blue on the LED AQI indicator

Possible reasons:
• The air is clean. PM are expected to be set to 0 (<1) or to show blue on the device if the air is clean.
or
• The sensor module filter is clogged with dust. This may happen if the device has been running for a long time in a polluted environment.

Actions:
1.Test the sensor:
• Unplug the air purifier for 10 seconds. Plug it again.
• Press the power button and wait a few seconds for the sensors to start.
• Blow out a candle or a match near the sensor inlet.
Note: "making dust" by shaking a cloth or similar may often not trigger the PM sensor as typical household are too large.
• Expected result: a peak in the PM values is expected.

If the values are still low are stuck to 0, see next action:

2. Try vacuuming the sensor module filter and test again. • Expected result: You should see a peak in PM values after this action. If the values are still low are stuck to 0, see next action:

3. If this did not help, please contact the Blueair Customer Support teams.