Paper 1 · People, Development and Environment
Ozone is considered a secondary air pollutant because it
AIs in the upper layers of the atmosphere
BIs formed by chemical reactions in the atmosphere ✓ Correct
CIs produced in industry
DHas a secondary role in causing pollution
Correct answer: (B) Is formed by chemical reactions in the atmosphere — Ozone is a secondary pollutant because it is formed by chemical reactions in the atmosphere, so that is the answer.
Explanation
★Ozone is a secondary pollutant because it is formed by chemical reactions in the atmosphere, so that is the answer.
★A secondary pollutant is not released directly but forms in the air.
★Ground-level ozone forms when other pollutants react in sunlight.
★So ozone is a secondary pollutant because it is made by reactions in the atmosphere.
★Its position or industrial link is not what makes it secondary.
★So the answer is that it is formed by chemical reactions in the atmosphere.
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