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British Dictionary definitions for sewage gas

sewage gas

noun
  1. gas given off in the digestion of sewage consisting of approximately 66 per cent methane and 34 per cent carbon dioxide
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012