Which of the following statements is not true about classical smog? (a) Its main components are ...

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Which of the following statements is not true about classical smog?
(a) Its main components are produced by the action of sunlight on emissions of automobiles
\( P \) and factories
(b) Produced in cold and humid climate
W.
(c) It contains compounds of reducing nature
(d) It contains smoke, fog and sulphur dioxide
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