1.- Carbon dioxide ( CO2)
a) Combustion of fossil fuels ( solid, gaseous liquids ) for energy purposes.
2.- Methane ( CH4)
a) Anachronistic fermentation on landfills.
b ) Aerobic treatment of wastewater.
c ) Animal poop.
3.- Nitrous oxide ( N2O )
a) Raw material in production of chemical industry.
b ) Digestion of animal poop.
4.- Hydrofluorocarbon (HFCs)
a) Production of HCFC -22.
b ) Leakage of insulating material.
5.-Perfluocarbono (PFCs )
a) Using fluid materials in cleaning process.
b)Using etching agent in production.
6.- Sulfur hexafluoride (SF6 )
a) Used as cover gas for magnesium casting process.
b) Used as an insulating gas for electricity.
c) Using etchant in production of semi conductors .
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