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Identify the correct statements.
i. Winter smog is reducing in nature due to presence of particulate carbon and $S O_{2}$
ii. The pollutant obtained from emission tubes of diesel engines is benzopyrene
iii. Photochemical smog is made up of PAN, $O_{3}$ and oxides of nitrogen
iv. CFCs are stable in troposphere and act as pollutants in stratosphere

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(i), (ii), (iii), (iv)

(i) & (iv) - only

(i) & (ii) - only

(ii), (iii) & (iv) – only

answer is A.

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