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An average of 0.247% water vapour (very variable) 
& approximately 1% of other gases 

These other gases are the noble gases consisting of :- 
Argon (0.93%) 
Neon (less than 0.01%) 
Helium (less than 0.01%) 
Krypton (less than 0.01%) 
Xenon (less than 0.01%) 
Radon (less than 0.01%) 
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Others gases are argon ,carbon dioxide,neon,helium,hydrogen,krypton,xenon and ozone.
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