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Pure Air- It contains 78% of nitrogen, 21% of oxygen and 0.03% of carbon dioxide and several other gases are also present in the pure air. This air is called pure air.
Pollute Air- The air in which addition pf harmful substances take place like nitrogen dioxide, sulphur dioxide, carbon monoxide etc. this air is said to be polluted and called Pollute air
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Pure air is air which does not contains any harmful substances in it.

polluted air is air which become as waste due to human activities.
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