What is the most abundant gas in Earth's atmosphere?

Nitrogen is the most abundant gas in Earth’s atmosphere. It constitutes around 78.08 Percentage by Volume in the atmosphere. The details of various gases in the air, particularly in the lower atmosphere is given below:

Constituent 

% by volume

Nitrogen 

78.08

Oxygen

20.95

Argon 

0.93

Carbon dioxide

0.036 

Neon

0.002

Helium

0.0005

Krypto

0.001

Xenon

0.00009 

Hydrogen

0.00005

Further Reading:

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