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Why it is possible you MAY not smell gas? In certain situations, the Mercaptan added (the sulfur or rotten egg smell) to natural gas supplies, maybe either filtered out or absorbed, leaving [...]

Mercaptan is also known as methanethiol and is a harmless but pungent-smelling gas which has been described as having the stench of rotting cabbages or smelly socks. It is often added to natural [...]