Discussion
Which one of the following is a secondary pollutant ?
Answer: B
The secondary pollutant is \(\mathrm{O_{3}}\), ozone.
A secondary pollutant is not emitted directly but forms in the atmosphere from reactions between primary pollutants. Ground-level ozone forms when nitrogen oxides and volatile organic compounds react in sunlight, which is why it peaks on sunny afternoons in photochemical smog.
Sulphur dioxide, carbon monoxide and nitric oxide are primary pollutants, released directly from combustion in vehicles, power plants and industry.
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