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The reason why is because there are to modes on your Air conditiniong, called fresh air mode and recycling mode, if you want to eliminate outside air put it on recycling mode. The answer to your question there are vents below your windshield to suck up fresh air mode and will pick up any smell outside for example cars exhaust fumes ETC.

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Q: Why do outside smells come through AC vents when it is operating?
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