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Question

Ozone is considered as secondary pollutant because
  1. It is formed by the oxidation of O2 of the atmosphere
  2. It is formed by the transformation of NOx in sunlight
  3. It is not primarily important
  4. It develops secondary effects on living organisms

A
It develops secondary effects on living organisms
B
It is formed by the oxidation of O2 of the atmosphere
C
It is formed by the transformation of NOx in sunlight
D
It is not primarily important
Solution
Verified by Toppr

Ozone is secondary pollutant because it is not emitted directly but is produced in a cycle of reactions involving two basic classes of compounds i.e., nitrogen oxides generically called NOx, including NO (nitric oxide) and NO2 and hydrocarbons.
So, the correct answer is option B.

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