Road dust is coming in the car. on 2000 Honda Civic

I drive 5 miles on gravel road, and dust is coming in the car. I've looked all over to see where it's coming in. I give up!

Asked by for the 2000 Honda Civic
is a/c on? blower on? maybe that's where the air coming in if your settings for fresh air outside not inside circulation for the air. its sucking the dust outside and blowing inside your vent, check your settings.