Answer: Air, one of the most important elements of our environment, is getting polluted continuously posing a great threat to our existence. No human or animal can survive without air. This essential element of our environment is getting polluted in various ways. Smoke of all kinds is the most common factor for causing air pollution. Man makes fire to cook food, to burn refuse and to melt pitch for road construction. All these things create heavy smoke and pollute the air. Smoke emitted from mills, factories, brickfields and industries also cause air pollution. Moreover, motor vehicles like cars, buses and trucks plying on roads and highways also produce a lot of smoke causing air pollution. Furthermore, by burning coal, petrol, diesel and oil, railway engines and power houses create smoke and pollute the air. But the most serious air pollution often occurs in big cities and industrial areas. Air pollution ultimately causes serious kinds of airborne diseases like hyper tension, cancer and so on. Sometimes serious kind of air pollution even leads to death. We must stop air pollution to keep the world a habitable place. It is man who can stop air pollution by planting many more trees for a healthier and happier life.
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