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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.
Noble gases Helium, neon, argon, krypton, xenon AND radon The Noble Gases typically have very low melting and boiling points, have a low density, are gas at room temperature, and are typically odorless, colorless, insipid and non-toxic (except for radon). They are either denser or lighter than air. Helium- Lighter than air 0.1786 grams density Melting point -272.0 Â°C Boiling point - 268.6 Â°C