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I don't think the auto recirc mode is meant to block 'quick' events such as driving through a bit of smoke etc.
It doesn't detect 'odours' either, just particles in the air AFAIK.
I would say its meant for heavy air pollution that is present for a few minutes.
If i'm behind a smokey old car , then putting manual recirc on does seem to stop the fumes after a few seconds. Auto recirc never seems to do anything!
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