2025 · Q125
Which one among the following is not a greenhouse gas?
general-sciencebiotech-environment-science
- ASulphur dioxide
- BMethane
- CNitrous oxide
- DFluorinated gas
Explanation
Methane, nitrous oxide and fluorinated gases (HFCs, PFCs, SF6) are all recognised greenhouse gases under the UNFCCC/Kyoto basket. Sulphur dioxide is an air pollutant that causes acid rain and has a net cooling (aerosol) effect — it is not classified as a greenhouse gas. Hence sulphur dioxide is the answer.