UPSC Prelims 2013 · Question 99 of 99

UPSC Prelims 2013 question on Photochemical Smog

Photochemical smog is a resultant of the reaction among

  1. NO2, O3 and peroxyacetyl nitrate in the presence of sunlight
  2. CO, O2 and peroxyacetyl nitrate in the presence of sunlight
  3. CO, CO2 and NO2 at low temperature
  4. high concentration of NO2, O3 and CO in the evening
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Answer: A. NO2, O3 and peroxyacetyl nitrate in the presence of sunlight

Photochemical smog is formed when nitrogen oxides (NOx) and volatile organic compounds react in the presence of sunlight. The major pollutants associated with photochemical smog include nitrogen dioxide (NO2), ozone (O3), and peroxyacetyl nitrate (PAN). Therefore, option 1 is correct.

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