What gases make up the air?

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Air Composition

The percentage of gases found in sea-level air, or another way of putting it - What makes up the air we breathe?

Element
or Gas
Chemical
Symbol
Percentage
of Air
NitrogenN278.084 %
OxygenO220.9476 %
ArgonAr0.934 %
Carbon DioxideCO20.0314 %
NeonNe0.001818 %
HeliumHe0.000524 %
MethaneCH40.0002 %
KryptonKr0.000114 %
HydrogenH20.00005 %
XenonXe0.0000087 %

Related: atmospheric layers

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