The CO2 monitoring is useful for finding major sources of LOCAL pollution, but, it really can not deal well with large 'Whiffs' of it.
OTOH, OCO2 is already showing where the REAL CO2 comes from, and is making a mockery of the numbers that the far left comes up with. Keep in mind that CO2 numbers are predicated on various items:
1) the first is via monitoring. That works well if you have monitors all over the nation. This is used heavily for doing calcs in the western nations. However, when monitors are NOT all over the nations, then you have an issue.
2) calculations based on gov. supplied numbers. This is what is used in most of the world, in particular, for China. THis fails since nearly ALL govs. CHEAT on these numbers.
3) Space based monitoring. OCO2 is now showing that numbers are wrong.
So, while I would not fully trust the numbers from Google, they will give an idea of where bad emissions are from. OTOH, Sats will give a better idea of which area CO2 is coming from, as well as being sucked up.
Thankfully, OCO3 is now being worked on, and will give a much better idea of where CO2 emissions are coming from within locations.