The GATE Grind

GATE 2024 ES – Question 30

Air and Noise Pollution · Gaseous Pollutants · 1 mark · Multiple select

Which are secondary air pollutants?

  1. $O_3$
  2. $HNO_3$
  3. $CO_2$
  4. $H_2SO_4$

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Correct answer: (A) $O_3$; (B) $HNO_3$; (D) $H_2SO_4$

Explanation

Tropospheric ozone forms through photochemical reactions; nitric acid forms from atmospheric nitrogen-oxide oxidation, and sulfuric acid from sulfur-oxide oxidation. They are standard secondary pollutants. CO₂ is predominantly categorized as a directly emitted primary pollutant in this comparison. Select **A, B, D**.

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