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NEET Easy

Which of the following is a secondary pollutant?

$SO_2$

$CO_2$

$CO$

$O_3$

Step-by-Step Solution

$O_3$ (ozone) is a secondary pollutant. These are formed by the reaction of primary pollutants. $CO$ is a quantitative pollutant, while $CO_2$ and $SO_2$ are primary pollutants.

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