UPPSC PCS 2014 · Question 12 of 150

Which one of the following is not a secondary pollutant?

Environment

APAN
BSmog
CSulphur dioxideCorrect
DOzone

Answer: C. Sulphur dioxide

Explanation

There are two types of pollutants – primary pollutants and secondary pollutants. Secondary pollutants are pollutants that form in the atmosphere when primary pollutants interact with other molecules or gases.

Source: edurev.in UPPSC Prelims 2014 GS Paper I with Answer Key and Solutions

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