1.

  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    
Answer» D. 3 and 4    


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