Which of the following is a secondary air pollutant?

Ozone

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Carbon dioxide

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Carbon monoxide

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Surfer dioxide

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Solution

The correct option is B Ozone
A primary pollutant is an air pollutant emitted directly from a source.
A secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere.
Examples of a secondary pollutant include ozone, which is formed when hydrocarbons ( $H C$ ) and nitrogen oxides combine in the presence of sunlight. Nitrogen oxide which is formed as $N O$ combines with oxygen in the air; and acid rain, which is formed when sulfur dioxide or nitrogen oxides react with water.

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