Question:

The type of pollution that gets increased during the day time and in the presence of O\(_3\) is :

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Photochemical smog forms in sunlight from NOx and hydrocarbons and contains ozone and other oxidants.
Updated On: Nov 4, 2026
  • Oxidising smog
  • Global warming
  • Acid rain
  • Reducing smog
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The Correct Option is A

Solution and Explanation

Photochemical (oxidising) smog is formed in the presence of sunlight, so it increases during the day. Its formation involves \(\mathrm{NO_2 \xrightarrow{h\nu} NO + O}\) and \(\mathrm{O + O_2 \rightarrow O_3}\); O3 is one of its main oxidising components (with PAN, HCHO, acrolein).
Reducing smog (classical smog, from SO2 and smoke) forms in cold, humid conditions and is worst in the early morning. Acid rain and global warming are not characterised by a daytime increase with O3.
Answer: (1) Oxidising smog
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