Umm, I hate to tell you, but it's air. It circulates. And something catastrophic enough to cause the atmosphere to become unbreathable by humans (i.e., a massive meteor strike like the one that is believed to have caused the extinction of the dinosaurs) is not likely to be confined to just a few select places. Even something more localized, like a volcanic eruption, might make the air unbreathable or at least mighty unpleasant for a few days, but it's not going to have a long-lasting effect.
Think of it as a swimming pool. If someone pees in one end of it, would you still want to go swimming in the other end? It might be okay initially, but eventually, the pee is going to circulate throughout the entire pool and it's going to be everywhere. Though it'll be more diluted, if that helps.
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timeasmymeasure
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Date: 2009-11-06 03:30 pm (UTC)Think of it as a swimming pool. If someone pees in one end of it, would you still want to go swimming in the other end? It might be okay initially, but eventually, the pee is going to circulate throughout the entire pool and it's going to be everywhere. Though it'll be more diluted, if that helps.