The smog is essentially caused by the presence of: (a) \( \mathrm{O}_{3} \) and \( \mathrm{N}_{2...

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The smog is essentially caused by the presence of:
(a) \( \mathrm{O}_{3} \) and \( \mathrm{N}_{2} \)
(b) \( \mathrm{O}_{2} \) and \( \mathrm{N}_{2} \)
\( \mathrm{P} \)
(c) Oxides of sulphur and \( \mathrm{N}_{2} \)
(d) \( \mathrm{O}_{2} \) and \( \mathrm{O}_{3} \)
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