The earth's atmosphere at sea level.
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78% nitrogen 20% oxygen and 2% other inert gases.
air is made up of some gases. i.e. it's made up of hydrogen, nitrogen, and mixture of other gases. but the most common is it is made up of nitrogen-78%, oxygen-21%, and other gases-1%air is made up of different gases such as oxygen, carbondioxide, nitrogen and noble gases.
You need two quantities to have a per cent - one of them as a percent[age] of the other.
In the air around us there is 78% nitrogen 21% oxygen 1% other gasses
Gases in air are nitrogen about 79%, oxygen about 20% and other gases 1%