Question

what would happen if there were no Air on the earth

Answer 1

nothing much
only you will die
and there will be nothing living left in this Earth

Answer 2

hey
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If there would be no availability of air on earth then there will be complete destruction of earth. No living organisms will survive on earth because all living organisms from the micro-organisms to the big whales cannot survive on earth without air.
There won't be any fire as we know that fire takes place only when oxygen is available.
There would be no atmosphere on earth and meteors can easily strike the earth causing huge destruction.
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I hope this answer helps you !