GATE 2023 AR — Planning – Question 27

Environmental Planning and Landscape · Environmental pollution- types, causes, controls and abatement strategies · 1 mark · Multiple select

Which is NOT a primary air pollutant?

Suspended particulate matter
Oxides of nitrogen
Volatile organic compounds
Peroxyacetyl nitrate

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Correct answer: (D) Peroxyacetyl nitrate

Explanation

PAN forms through atmospheric photochemical reactions involving precursor pollutants; it is secondary. The other listed categories can be emitted directly from sources and are treated here as primary pollutants. Select D. Classification concerns formation, not toxicity.

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