The GATE Grind

GATE 2019 CE (CE2) – Question 19

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

Which pair contains ONLY primary air pollutants?

  1. Hydrocarbons and nitrogen oxides
  2. Hydrocarbons and ozone
  3. Ozone and peroxyacetyl nitrate
  4. Nitrogen oxides and peroxyacetyl nitrate

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Show answer and explanation

Correct answer: (A) Hydrocarbons and nitrogen oxides

Explanation

Hydrocarbons and nitrogen oxides can be emitted directly by combustion and other sources,so both are primary pollutants. Ozone and peroxyacetyl nitrate are formed through atmospheric reactions and are secondary. Therefore **hydrocarbons and nitrogen oxides,A**.