Air is an important element in our environment.
Clean air is essential for life but polluted air is very harmful. Air can be
polluted in many ways. One thing that pollutes air is smoke. People also make
more smoke by burning wood, bricks, refuse, materials and melting pitch for
road construction. In big cities buses, trucks and cars always ply in the
streets. They burn petrol and diesel and pollute air by emitting smoke. Serious
air- pollution occurs in industrial towns. Mills and factories burn coal, oil
and chemicals and emit huge smoke. All kinds of smoke mixes with air and
pollutes it. The rotten dead bodies of the animals also pollute air. We become
sick by inhaling polluted air. So for healthier and happier life we should try
to prevent air pollution.
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