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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.
In some cases a concentration of only a few parts per million. can be quickly lethal. Carbon monoxide and hydrogen sulfide are the two most widely occurring toxic gases, especially in confined. space entry. Carbon monoxide is a byproduct of incomplete combustion, and will always be present whenever. combustion occurs. Hydrogen sulfide is another very common and very dangerous toxic gas.