• # question_answer   Consider the following emission of an IC engine: (1) CO                           (2) HC           (3) $N{{O}_{X}}$                    (4) Particulates   Which of these emissions cause photochemical smog? A) 1 and 4            B) 1 and 2      C) 2 and 3            D) 3 and 4

Correct Answer: C

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