Element Abundances in the Earth's Atmosphere | The Elements Handbook at KnowledgeDoor

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Element

Element Abundances in the Earth's Atmosphere

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Notes

Nitrogen

78.08%

N2

Oxygen

20.95%

O2

Water

≈1%

H2O (highly variable)

Argon

9340 ppm

Carbon Dioxide

380 ppm

CO2

Neon

18.18 ppm

Helium

5.24 ppm

Methane

1.7 ppm

CH4

Krypton

1.14 ppm

Hydrogen

0.55 ppm

H2

Reference (Click the next to a value above to see complete citation information for that entry)

National Aeronautics and Space Administration (NASA). Earth Fact Sheet. http://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html. Accessed on September 18, 2011.

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