Which of the following is a secondary pollutant
(1) CO
(2) CO2
(3) SO2
(4) O3
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The correct option is(4) O3
Explanation:
Ozone (O3) is a secondary pollutant as it is formed by the reaction amongst the primary pollutants. On the other hand, SO2 is a primary pollutant. These pollutants persist in the environment in the form they are passed into it. CO is a qualitative pollutant. It is considered as pollutant only when its concentration reaches beyond a threshold value in the environment. CO2 is a quantitative as well as a primary pollutant.