Multiple choice

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

Sulfur dioxide is a key contributor to industrial smog, formed when sulfur-containing fuels are burned. Areas with high concentrations of industrial activity and coal combustion typically experience elevated sulfur dioxide levels, which react with moisture and other pollutants to form smog.

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