Minimal Livable Atmosphere

This question may be a bit broad, but I'm basically wondering what minimal things humans need to have in an atmosphere in order to survive. Let's assume we have Earthlike gravity, and are only dealing with perhaps the first 10 or so elements. Life does not have to have developed there. I'm especially interested in what kinds of atmospheric conditions one could expect to find occurring naturally on a solid planet, and what elements/compounds need to be there or not be there for humans to survive, at least for up to an hour.

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Minimal Livable Atmosphere

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