1.

The smog is essentially caused by the presence of

A.  Oxides of sulphur and nitrogen  
B.  \[{{O}_{2}}\]and\[{{N}_{2}}\]
C.  \[{{O}_{2}}\] and\[{{O}_{3}}\]
D.  \[{{O}_{3}}\]and \[{{N}_{2}}\]
Answer» B.  \[{{O}_{2}}\]and\[{{N}_{2}}\]


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