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Outside air smells with HVAC off/recirc

The weather in NorCal has been mild for the past month or so and I have been able to drive with the HVAC off. In my ICE car, driving with the HVAC off with recirculate mode on causes most outside smells (especially diesel smog) to be kept out. In my late 2014 85, many of these smells/smog enter the cabin quite easily with HVAC off. Is this normal?