Question about car windows and air pressure

[Fuel]

What happens to any smell when you open one front window? What about both front windows? What about both front and one back window open? What about various combinations?

......I would think one front window open wold suck out a lot of the cars' inner air because of decreased air pressure. This would cause drop in cabin air pressure because more air left than did take it's place. Is this correct?

2 or 3 windows open is far too complex for me.

[kanicbird]

Well in short, if air is moving along an opening it will 'suck' air out of the opening.

[Squink]

However, the side mirror, or other obstructions to external airflow might redirect enough air to cause an increase in cabin presseure.

[something clever]

if you have the AC on at all, or the vent, or the heater.. and you 99.9% most likely will, (because really, when was the last time you turned the fan to "OFF"?) then the air will be sucked out, and the air coming in the vents will come in to replace the air coming out, in some cars it seems to help the ac blower motor out, when the windows are down, a little more air comes out it seems..