Discussion
Match each pollutant in List I with its dominant source in List II.
List I
A. Sulphur dioxide
B. Ammonia
C. Carbon monoxide
D. Chlorofluorocarbons
List II
1. Livestock manure and fertiliser application
2. Combustion of sulphur-bearing coal and oil
3. Legacy refrigeration and aerosol propellant use
4. Incomplete combustion in engines and stoves
Select the correct match.
Answer: B
Correct answer: A-2, B-1, C-4, D-3
Each pollutant is matched to its dominant source. Sulphur dioxide (A) comes from combustion of sulphur-bearing coal and oil (2); ammonia (B) from livestock manure and fertiliser application (1), which supply 80 to 90 per cent of the total in most countries.
Carbon monoxide (C) comes from incomplete combustion in engines and stoves (4), and chlorofluorocarbons (D) from legacy refrigeration and aerosol propellant use (3) - legacy because production has been phased out, yet the long-lived stock continues to reach the stratosphere.
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