Unfortunately, most of the air we
breathe is not pure. It contains harmful substance called pollutants which
cause air pollution. Air pollution is one of the major problems of the world. Air
pollution can be reduced by planting more trees. Trees also bring rain which
helps in cleansing the atmosphere. Factories and power stations are provided
with all chimneys which carry smoke and waste gases high up into the air. In some
industries, to settle down pollutants, wastes are sprayed with jets of water in
scrubbers, before they reach the chimneys. In a few modern industries, electric
current used to check smoke and dust particles. Nowadays, cars are fitted with
a special device called a catalytic converter.
The catalytic converter converts hydrocarbons and carbon monoxide into
harmless water vapors and carbon dioxide. New car engines are designed to use
lead-free or unleaded petrol which is less harmful than the leaded one.
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