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?


Thanks,

Andrew
"It has been said that the primary function of schools is to impart enough facts to make children stop asking questions. Some, with whom the schools do not succeed, become scientists." - Schmidt-Nielsen "Memoirs of a curious scientist"