Which of the following is not a greenhouse gas? (1) Water vapour (2) O2 (3) O3 (4) CO2

Which of the following is not a greenhouse gas? (1) Water vapour (2) O2 (3) O3 (4) CO2
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(2) O2 Explanation: Greenhouse gases are those that can absorb and emit infrared radiation, but not radiation in or near the visible spectrum. The most abundant greenhouse gases in Earth's atmosphere are: Water vapor (H2O), Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Ozone (O3) and CFCs.
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