We have a Dyson air purifier at the bedroom, which had some unusual high readings from PM 2.5 and PM 10 sensors in the last couple of days. The readings had sudden increases, once in the evening and another time in the early morning, both were from numbers around 10 to over 150 within 30 minutes, and kept in a high value for a few hours. There was no changes in the environment.
Could this be a sensor issue?