The most prominent gas found in the atmosphere is nitrogen. The proportion of this gas is approximately 78.08 per cent. Apart from this, other gases include oxygen 20.95 per cent, argon 0.93 per cent, carbon dioxide 0.03 per cent, neon 0.0018 per cent, helium 0.0005 per cent, ozone 0.00006 per cent and hydrogen 0.00005 per cent.