My 2009 E-320 Diesel when stopped on traffic light with air conditioning running in ventilation only (only air from outside) the incoming air come with a smell of burned diesel. Even with no cars stopped in front of my car the incoming air will have the same smell. When driving I don't have this problem, certainly because the car is in movement, I don't have this problem.
Should I use a carbon activated filter? Is this issue from somewhere in the car?
As I bought this car not long ago I don't know what kind of filter this car have installed.
Anyway your suggestion will be appreciated.

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Nyck - TX - USA