CO2,CH4,N2O,O3
O3,NO2,SO2,Cl2
CH4,O3,N2,SO2
O3,N2,CO2,NO2
CO2, CH4, N2O, and O3 are the greenhouse gases. These gases are responsible for global warming. For example, carbon dioxide, which is emitted from vehicles, factories, etc., is a mainly responsible greenhouse gas.