GATE CE 2019 Set 2 — Question 19
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Environmental Engineering → Air Pollution → Types of Air Pollutants
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Question
Which one of the following options contains ONLY primary air pollutants?
Correct answer
(A) Hydrocarbons and nitrogen oxides
Solution
Primary air pollutants are those emitted directly from a source into the atmosphere. Common examples include hydrocarbons and nitrogen oxides (). Secondary pollutants are formed in the atmosphere through chemical reactions between primary pollutants and other atmospheric constituents. Examples include ozone () and peroxyacetyl nitrate (PAN). Option (A) is the only one containing only primary pollutants.
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