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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.
Heavy gases produce the opposite effect because sound travels much more slowly through them. Xenon and sulphur hexaflouride are common gases used to demonstrate this effect because they are relatively inert and harmless. Other heavy gases may be toxic, and any non-air gas can cause suffocation when inhaled in excess.