Multiple choice general knowledge

Smog is a common pollutant in places having a higher concentration of

  1. sulphur dioxide

  2. ammonia

  3. nitrogen

  4. oxygen
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A Correct answer
Explanation

Smog formation is primarily associated with high sulfur dioxide concentrations from industrial emissions and vehicle exhaust. Sulfurous smog (London smog) forms when SO2 reacts with moisture and particulates in the atmosphere.

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