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ooooook, in the city this would create your own smog box!
Where do you think the ac gets it's air from? Either inside the cabin, or the same place this thing gets it's air from.
Except the car's HVAC system passes air through a filter. How much of a difference that makes is going to depend on the type of filter and whether it's been changed sufficiently often, but it's definitely doing more than nothing.
👆
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