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Sour Gas: Natural gas or any other gas that contains more than 4 ppmv of hydrogen sulphide (H2S) is commonly referred to as "sour". This is because the odour of H2S gas in air at very low concentrations is similar to that of rotten eggs. Sour gas can be difficult to produce due to its tendency to cause corrosion and sulphide stress corrosion cracking, particularly in pipelines.
Source: Petrowiki

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