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mixture

The standard composition of dry air is (in volumes):

Nitrogen - 78,084 %

Oxygen -20,946 %

Argon -0,934 %

CO2- 0,0039 %

Ne - 0,001818 %

He - 0,000524 %

CH4 - 0,000179 %

Kr - 0,000114 %

H - 0,000055 %

NO2 - 0,00003 %

Water vapour

Also traces of Xe, Rn, contaminants, powdered materials.

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