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(A) Smog is a type of air pollution. Photochemical smog is primarily caused by the presence of oxides of nitrogen $(NO_x)$ and volatile organic compou

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Oxides of sulphur and nitrogen

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(A) Smog is a type of air pollution. Photochemical smog is primarily caused by the presence of oxides of nitrogen $(NO_x)$ and volatile organic compounds $(VOCs)$ in the atmosphere,which react in the presence of sunlight. Classical smog (London smog) is caused by a mixture of smoke,fog,and sulphur dioxide $(SO_2)$. Therefore,the presence of oxides of sulphur and nitrogen is the primary cause of smog.

The smog is essentially caused by the presence of

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