Which of the following is a secondary pollutant?
$SO_{2}$
$CO_{2}$
CO
$O_{3}$
Explanation:
$O_{3}$ (ozone) is a secondary pollutant. These are formed by the reaction of primary pollutant.
CO – Quantitative pollutant
$CO_{2}$ – Primary pollutant
$SO{2}$ – Primary pollutant
$O_{3}$ (ozone) is a secondary pollutant. These are formed by the reaction of primary pollutant.
CO – Quantitative pollutant
$CO_{2}$ – Primary pollutant
$SO{2}$ – Primary pollutant