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Natural Resources — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceNatural Resources1 Mark
Question
What is smog?
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Answer

Smog is a type of severe air pollution. The word "smog" was coined in the early $20^{\text {th }}$ century, and is a contraction of the words smoke and fog to refer to smoky fog; its opacity, and odor.

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