GATE CE 2019 Set 1 — Question 28
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Environmental Engineering → Air Pollution → Types of Air Pollutants
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Question
Which one of the following is a secondary pollutant?
Correct answer
(A) Ozone
Solution
Pollutants are classified into two categories:
1.Primary Pollutants: Emitted directly from a source. Examples include Carbon Monoxide (CO), Hydrocarbons, and Volatile Organic Compounds (VOCs).
2.Secondary Pollutants: Formed in the atmosphere through chemical reactions between primary pollutants and other atmospheric constituents. Ozone () is a secondary pollutant formed by the reaction of nitrogen oxides () and VOCs in the presence of sunlight (photochemical reaction).
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