Atmosphere of big cities is polluted most by :

Automobile exhausts

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Radioactive fall out

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Household waste

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Pesticide residue

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Solution

The correct option is B Automobile exhausts
The main source of pollution in metro cities is automobile exhausts.

As greater the city, more the population which uses private transport.

Hence, increase in pollution is caused by automobile exhausts.

Therefore, option A is correct.

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