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Composition of the Atmosphere

The atmosphere is well mixed below 100 km, and apart from its highly variable water vapour and ozone contents, its composition is as shown below, excluding solid and liquid matter in suspension (aerosols).

Gas	Symbol	% by weight	% by volume
Nitrogen	N2	75.52	78.09
Oxygen	O2	23.15	20.95
Argon	A	1.28	0.93
Carbon dioxide	CO2	0.046	0.035
Neon	Ne	0.012	0.0018
Helium	He	0.0007	0.0005
Methane	CH4	0.0008	0.00015
Krypton	Kr	0.003	0.0001
Ozone	O3	0-0.01	Variable
Water vapour	H20	0-4	Variable

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