Hello!
I guess if the sensor in el Prat de Llobregat functions properly. In the last days, the mesaurments of this sensor differ a lot from the ones that you can observe until the middle of Novembre, on the one hand. On the other hand, these latest mesurements don’t fit with other mesurements in the same zone, such as the ones from the Spanish environment ministry and the ones from the Catalan air pollution mesurement system.
Could there be a problem with this sensor?
Your’s,
Bertran