Dry unpolluted air is usually considered to contain about :-


78.08% nitrogen

20.95% oxygen

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%)


Regarding non-Nobel gases, there is also Carbon dioxide at 0.038%, and tiny traces of Hydrogen.