Question

All are primary pollutants except

• A. $S{O}_2$
• B. $H_{2}S{O}_4$
• C. $N{O}_2$
• D. particulate matter

Answer 1

Answer: (B)

$H_{2}S{O}_4$ is a secondary pollutant which is formed by the reaction of primary pollutant $S{O}_2$ with oxygen and water.