PM2.5 and PM10 showing almost identical (low) values

From 2017 I have been here in Torino (Italy) one of Safecast’s beta testers with their air quality monitoring device using the OPC-N2 sensor by Alphasense. As such I collected a lot of data on PM1, PM2.5 and PM10 along a couple of years.

A few days ago I started with the Airnote, but noted that the readings of the PM2.5 and PM10 are surprisingly similar (in may points even identical!). See an example in the attached image:

This seems quite unusual. I wonder if there is something wrong in my Airnote’s sensor or if I am missing something. Your opinion would be appreciated…

Thank you very much and best regards.



Thanks for the posting.
I will check why this is happening.