Antifreeze is both poisonous and lethal. A teaspoon of it is enough to kill a small to mid sized animal. However, a few whiffs of it doesn't mean it's time to run off to the emergency room. In the vapor form you're experiencing, AF is much less concentrated and is more of an annoyance than it is dangerous. I suspect you headaches are more of a reaction to the smell over anything else.
The vents at the base of the windshield is where fresh air is drawn into the car's heating system. Basically the AF fumes are being directed right towards that fresh air intake for your breathing pleasure.
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