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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.
Examples of this group are nitrogen, helium, neon, argon and krypton. Flammable Gases: Some cryogenic liquids produce a gas that can burn in air. The most common examples are hydrogen, methane and liquefied natural gas. Oxygen: Many materials considered as non-combustible can burn in the presence of liquid oxygen.