Even in clean air, the AirBeam2 might not read zero. Instead, it may read a low number. Even when the air is very clean, we are often generating PM during our normal routines, such as kicking up dust as we walk, or shedding particles from our clothes.
If the AirBeam2 constantly reads 0 no matter the environment it is in, there might be a problem with the detector inside the AirBeam2. In this case, please open a support ticket with our team.