No Ozone readings

I have a new PurpleAir Flex Air Quality Monitor. It does not give readings for Ozone. See attached screenshot
All other data types give readings.
Is this a fault or a “feature”?

Hi @Billylou, PurpleAir sensors do not currently measure ozone. More information on why this data layer appears on the PurpleAir map is available here: The Ozone Data Layer on the PurpleAir Map.