23/09/23 02:45 O3 reporting zero. Alarms show almost zero flow on A and B so likley to be internal pumps. Reported and requested engineer to callout

12/10/2023 14:15 Engineer on-site, now fixed. Added and extra external Thomas pump to the O3 analyser.

Engineers report : see Urban Observatory Github :

12_10_2023_Newcastle University_Gosforth _Callout Instrument Fault_11969_Marius Barbulescu.pdf

Data will be missing during this period.