Why does "fresh air" relieve feelings of nausea?

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Why does "fresh air" relieve feelings of nausea?
« on: 14/05/2010 22:28:03 »
Another question on nausea:

Cool dry "fresh" air relieves feelings of nausea.
Hot wet air (like in a shower-room) makes it far worse.  Why?

Why does having a stuffy nose, or holding your nose closed exacerbate pre-existing feelings of nausea? Is this related to the humidity effect?

What's going on physically or phsyiologically?
Is there some evolutionary explanation too?


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