Whether the fog is inside or outside your car windows, it’s potentially dangerous as it hinders you from having a clear view in all directions.
If you are starting to see fogged-up car windows, you should change the settings so that the air gets pulled up from outside.
Turn your car fans on to the highest setting and turn the air temps down as cold as possible. But be prepared to shiver a bit, as this is the fastest but coldest method.
Your car’s defrost vent will direct air straight at your windshield, but the cool air will help your windshield temperature to match the air temperatures outside.
Turning down the air conditioner will warm your car and get the inside air temperature to match the outside better.
Turn the windshield wipers on to their lowest setting and allow them to run until the fog is all cleared up.
Roll down your car windows as far as you can so that the warm air outside gets into the cool interior of your car.