Composition of the atmosphere

The components of dry air near the Earth's surface.
GAS SYMBOL PERCENTAGE BY VOLUME
Nitrogen N2 78.0
Oxygen O2 21.0
Argon Ar 0.93
Carbon Dioxide CO2 0.035
Neon Ne 0.001 8
Helium He 0.000 52
Methane CH4 0.000 02
Krypton Kr 0.000 011
Ozone O3 0.000 002
Nitrogen dioxide NO2 0.000 000 1
Xenon Xe 0.000 000 086

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