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The atmosphere is constantly moving, so I doubt there is huge difference anywhere at sea level.... it all gets mixed up!
If you consider gaseous O2 then it is relatively the same all over the world. If total oxygen, then there is more sequestered in rocks than there is in the atmosphere. Think of all the rust that is on an abandoned farm. Then consider how much of the earth has red sand, red muds, etc. (iron oxide). On top of that, oxygen is bound in crystal structures for a LOT of mineral. So the amount of oxygen in the earth is more than that in the atmosphere.