Which one among the following is not a greenhouse gas?

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Which one among the following is not a greenhouse gas?

Methane
Ozone
Chlorofluorocarbon
Sulphur dioxide
This question was previously asked in
UPSC CAPF – 2012
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Greenhouse gases are atmospheric gases that absorb and re-emit infrared radiation, trapping heat in the atmosphere and contributing to the greenhouse effect. Common greenhouse gases include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), water vapor (H2O), ozone (O3 – especially tropospheric ozone), and chlorofluorocarbons (CFCs).
Sulphur dioxide (SO2) is a significant air pollutant that contributes to acid rain and respiratory problems. While it can form aerosols (like sulfate aerosols) that can indirectly affect climate (often causing a cooling effect by reflecting sunlight), SO2 itself is not considered a primary greenhouse gas that traps infrared radiation in the same way as the others listed.
Methane, Ozone (tropospheric), and Chlorofluorocarbons are all recognized as potent greenhouse gases contributing to global warming. Sulphur dioxide’s primary role in the atmosphere is related to air quality and the formation of aerosols.

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