Air pollution

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 play 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.