CO2 is a bit of an outlier in the groups of pollutants emitted by a car. Modern cars will emit way less of the other pollutants that are directly unhealthy for humans to breathe (NOx, CO, particulate matter, etc.).

I know the thread is mostly for fun, but only considering CO2 is a bit misleading when accessing how environmentally (un)friendly a car is.

That does not matter. It only complies with Euro 3 emissions requirements.