The GATE Grind

GATE 2019 CE (CE1) – Question 28

Air Pollution and Municipal Solid Wastes · Air pollution: pollutants, sources, impacts, control and air quality index · 1 mark · Multiple choice

Which is a secondary air pollutant?

  1. Ozone
  2. Carbon monoxide
  3. Hydrocarbon
  4. Volatile Organic Carbon (VOC)

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Show answer and explanation

Correct answer: (A) Ozone

Explanation

Ground-level ozone forms through atmospheric photochemical reactions involving precursor pollutants and sunlight. It is therefore a secondary pollutant. Carbon monoxide and the listed hydrocarbons/VOCs are commonly emitted directly as primary pollutants. **Answer:ozone,A**.