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.