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

  1. A. CFC
  2. B. CH_{4}
  3. C. N_{2}O
  4. D. Water vapour

Correct Answer: C. N_{2}O

Explanation

Among the specific gases listed, Nitrous oxide (N_{2}O) has a very long average atmospheric residence time of approximately 114 years, which is significantly longer than methane (CH_{4}) and water vapor.

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