Welcome to European Tribune. It's gone a bit quiet around here these days, but it's still going.
The volume of air per square meter of ground depends on how high your ceiling is. As ceilings go, the troposphere/stratosphere boundary is pretty high.

And as far as the higher density goes, it does increase the ground-level partial pressure (and thus the concentration per cubic meter) in equilibrium. But the troposphere is not in equilibrium - there is rather significant convection.

- Jake

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by JakeS (JangoSierra 'at' gmail 'dot' com) on Thu Mar 31st, 2011 at 06:57:06 AM EST
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