Discussion
Which of the following is a secondary pollutant gas ?
Answer: C
The secondary pollutant is ozone (\(\mathrm{O_{3}}\)).
A primary pollutant is emitted directly from a source; a secondary pollutant forms in the atmosphere by reactions among primary pollutants. Ground-level ozone is produced when nitrogen oxides and volatile organic compounds react in sunlight, as in photochemical smog.
Carbon dioxide, carbon monoxide and methane are all released directly from combustion, decay or other sources, so they are primary pollutants.
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