Whether you are driving or sitting in traffic, the same fumes are coming out of the cars around you. Granted when not moving they are more concentrated. But your filters on your air intakes are supposed to stop the pollutants from coming into your car. If you are sitting with your windows down, no filter but better than running your air. It’s not dangerous, per se, but I wouldn’t recommend sitting by the exhaust of a tractor trailer for hours on end.
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