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UPSC Prelims 2019 Paper-1 📅 02 Jun, 2019

Consider the following:
1. Carbon monoxide
2. Methane
3. Ozone
4. Sulphur dioxide

Which of the above are released into atmosphere due to the burning of crop/biomass residue?

A
1 and 2 only
B
2, 3 and 4 only
C
1 and 4 only
D
1, 2, 3 and 4
Result Summary
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UPSC Prelims
2019 • 02 Jun, 2019 • Paper-1
Consider the following:
1. Carbon monoxide
2. Methane
3. Ozone
4. Sulphur dioxide

Which of the above are released into atmosphere due to the burning of crop/biomass residue?
Correct Answer
1, 2, 3 and 4
Chemical Emission Analysis: The burning of agricultural biomass (like stubble burning) is an incomplete combustion process. It directly releases large amounts o......
Ref/Book : UPSC Prelims 2019
Ref. Subject Environment
Chapter -
Ref. Topic Pollution
Pg. No -
💡 Analysis & Explanation
Chemical Emission Analysis ▼
The burning of agricultural biomass (like stubble burning) is an incomplete combustion process. It directly releases large amounts of Carbon monoxide (CO), Methane (CH4), and Sulphur dioxide (SO2), alongside particulate matter and volatile organic compounds (VOCs).
Ozone Formation ▼
While ground-level ozone (O3) is not directly released by the fire, the combustion directly emits nitrogen oxides (NOx) and VOCs. These primary pollutants undergo photochemical reactions in the atmosphere to rapidly synthesize secondary pollutants, with ground-level ozone being a major resultant. Hence, in scientific atmospheric inventories, ozone is considered a resulting emission of biomass burning.
Conclusion ▼
Consequently, all four listed gases are generated as a direct or closely ensuing result of crop residue burning.
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