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Sewer gas is a complex mixture of toxic and nontoxic gases produced and collected in sewage systems by the decomposition of organic household or industrial wastes, typical components of sewage.
CLASS 2 â GASES. Gases are defined by dangerous goods regulations as substances which have a vapour pressure of 300 kPa or greater at 50Â°c or which are completely gaseous at 20Â°c at standard atmospheric pressure, and items containing these substances.