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Landfill gas is a mix of different gases created by the action of microorganisms within a landfill as they decompose organic waste, including for example, food waste and paper waste. Landfill gas is a type of biogas, which is approximately forty to sixty percent methane, with the remainder being mostly carbon dioxide. Landfill gas often contains nitrogen gas that is pulled in from the atmosphere during collection. Trace amounts of non-methane volatile organic compounds (VOCs), siloxanes, and hydrogen sulfide comprise the remainder (<1%). These trace gases include a large array of species, mainly simple hydrocarbons.
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