Hey Sam,
In the description of his project, Milad wrote “The image below shows the concentration of carbon dioxide in the atmosphere. One can see how the gas is distributed within the environment”.
However, we know that exhaust gases do not consist of 100% CO2. Unless we have the real value for the CO2 source flux, it won’t be possible to convert it to ppm.
Please refer to this thread for a more detailed discussion on a similar simulation.
/Ric