I found a minor code defect for showing the CO2 Medium icon. in the setMetricIcon function you use “CO2_mid” for the value, but else were in the code it is “CO2_med”. After making both “CO2_med” (my random choice ) it works fine.
Well, I’d normally wait for a more substantial change. It’s only actually a one-character change to one file. Do you have a difficulty with getting it from the development branch?