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Mention the major cause of air pollution in metro cities. Write any three ways by which it 

can be reduced.

Explanation:

The major cause of air pollution in metro cities is vehicular pollution and industrial

pollution.

Three ways by which the pollution can be reduced are:

- use of catalytic converters in vehicles.

- use of CNG as an alternative to petrol/ diesel.

- use of lead-free petrol/ diesel.

- application of Euro III norms for vehicles.

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