Smell from outside

hi anyone encounter smell from outside the car ? I driving a f30. I have press either A or M still the same especially when a lorry or van In front .can smell the exhaust ...any Bros have any idea.
Thank in advance
 
Use M because A let’s it in with time intervals.

Check the ac filter ...
 
Aircon filter ok ?
 
In that will have to check the if the vent is able to fully close.
 

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