| S. No. | GASES | Major sources |
| 1. | CO2 | Fossil fuel combustion, deforestation, respiration. |
| 2. | CH4 | Wetlands, anaerobic decomposition of organic wastes, termites. |
| 3. | N2O | Natural soils, fertilizers, fossil fuel combustion. |
| 4. | O3 | Photochemical reactions in troposphere, transport (diffusion) from stratosphere. |
| 5. | CFC-11 | Manufacturing of foams, aerosol propellant. |
| 6. | CFC-12 | Refrigerant, aerosol propellant, manufacturing of foams. |
| 7. | CFC-113 | Electronics solvent. |
| 8. | HCFC-22 | Refrigerant, production of fluoropolymers. |
| 9. | CH3CCI3 | Industrial degreasing solvent. |
| 10. | CC14 | Intermediate in production of CFC-11, CFC-12, solvent. |
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