Which greenhouse gas has maximum average residence time in the

Which greenhouse gas has maximum average residence time in the atmosphere?

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CFC

CH₄

N₂O

Water vapour

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CDS-1 – 2024

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The correct answer is CFC (Chlorofluorocarbon).

Greenhouse gases have varying residence times in the atmosphere. Among the options provided, Chlorofluorocarbons (CFCs) have the longest average residence times, typically ranging from decades to several centuries.

Water vapour has a very short residence time (days). Methane (CH₄) has a residence time of about 12 years. Nitrous oxide (N₂O) has a residence time of about 121 years. CFCs, though also potent greenhouse gases, were primarily known for their role in ozone depletion and their long atmospheric lifetimes make them persist for a very long time, contributing to warming over extended periods.

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