If there is no trees in the desert, than why is it just as easy to breathe as any other place?

Question

I can't find anyone who can aswer this. Thanks for your comments.

Answer 1

I think you'll be interested in this article (in brief: [1] much of the oxygen is provided by organisms in the oceans; [2] there are plants in the desert, even if trees are in short supply; and [3] remember that global currents mix the gases in the atmosphere, so you do not need to be standing right beside a photosynthesizing organism to breathe):

http://www.wisegeek.com/where-does-atmos...

Answer 2

There are trees in the desert, just not many. It is easy for many people to breathe in desert environments because there is less pollen than in more humid climes