Carbon monoxide concentration within the air of an underground parking lot

Simulations are performed to see if there was enough ventilation in a parking lot. The carbon monoxide concentration in the air is measured and how much carbon monoxide is ventilated at the parking lot ventilation shaft.

The following questions were answered:
Are the ventilation openings located right?
Are the ventilation openings large enough?
What is the average concentration of carbon monoxide at the ventilation openings?
How is the carbon monoxide distributed within the parking lot? And how high is the highest concentration?