Material/Constituent elements of air

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Approximate composition of dry atmosphere by volume:

Element  % vol
Nitrogen 78.08
Oxygen 20.95
Argon 0.93
Carbon < 0.01
Others trace

Not included in above dry atmosphere:
Water vapour 11px-Wikipedia_logo.jpg (variable) ~1%

Source: NASA
Carbon dioxide updated (to 1998) by IPCC TAR table 6.1 [1]. Figure for carbon extrapolated from this
Edited text from [2]
Element links in list point to Wikipedia article