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(Some of) the gases in the air and percentage: Nitrogen - 78.09 % Oxygen - 20.95% Argon - . 93% Carbon Dioxide - .02% -.04% Neon - .0018% Helium - .0005% Krypton - .0001% Hydrogen - .0005% Xenon - .000008% Ozone - .000002% Radon - Traces