Hi there

The current Co2 Concentration map measures in PPBV (parts per billion per volume)
Co2 is officially measured in Part Per Million or Parts per Million per volume

If you convert the average CO2 concentration from the map now it is 149 PPBV but if you convert that to parts per million you get 0.149 parts per million but the global average CO2 concentration is 417 Part Per Million

Tell me if I'm wrong but I know it for sure!