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PU is an exaggerated pronunciation of pew, an interjection that is appropriate when you smell something foul.
Sometimes people describe that they noticed a carbon monoxide smell .. Although there could have been carbon monoxide in the air they were breathing and smelling, carbon monoxide does not smell in and of itself. Carbon monoxide is odorless, colorless, tasteless, non-irritating and toxic.Carbon monoxide is formed by the incomplete combustion (burning) of materials containing carbon and can be produced by virtually anything that burns.ombustion also produces heat, smoke, and number of other elements. In addition to carbon monoxide, nitrogen oxides, sulfur dioxide, particulates, and other toxins are also produced during combustion.