Why is it dangerous to breath in car exhaust air?

because is contains mostly CO2 and CO which are poisonous at the concentrations found The exhaust from an internal combustion engine that burns a fossil fuel (hydrocarbon) will always contain some carbon monoxide. Carbon monoxide is colorless, odorless, and tasteless and really likes your blood. It attaches to your blood's hemoglobin some 500 times tighter than oxygen and it will not let go. After about half your blood is tied up carrying carbon monoxide around, you suffocate from lack of oxygen. You will make a great looking corpse because carbon monoxide makes your blood turn bright red so you will look really healthy even 'tho you're dead. Find a car that burns hydrogen. The exhaust will contain mostly steam (water vapor) and a few oxides of nitrogen that won't hurt you that bad.