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Air is a important element of our environment. It is life. Without it we cannot live for a single moment. Pure air is useful to health. But pollution air is harmful to health. Air us polluted in many ways. Smoke from motor vehicle causes air pollution. Somoke from mils and factories also pollutes air. Smoke from bike-field is also responsible for air pollution. Melting pitch and cooking food with wood and coal also causes air pollution.
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