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Q.
The smog is essentially caused by the presence of
Jharkhand CECEJharkhand CECE 2008
Solution:
$ \text{NO,}\,\text{N}{{\text{O}}_{\text{2}}}\text{,}\,\text{S}{{\text{O}}_{\text{2}}} $ and $ \text{S}{{\text{O}}_{\text{3}}} $ are responsible for smog (environmental pollution).