1.

 Which of the following gases is regarded as an atmospheric pollutant?

A. \[{{O}_{2}}\]                                     
B.                         \[{{O}_{3}}\]                    
C.                        \[S{{O}_{2}}\]                                   
D.                         \[{{N}_{2}}\]
Answer» D.                         \[{{N}_{2}}\]


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