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Natural ground gases such as methane and carbon dioxide are found widely in soils and rocks, as they are an integral component of the geochemical cycle of the Earth. Methane and carbon dioxide can also occur due to the activities of man such as landfilling waste (landfill gas) and by mining (mine gas)

Campaign image for Subsurface MOFU

Landfills are sites where waste materials are disposed by burial, and the biogenic gases produced on these sites are known as ‘landfill gases’. Landfill gases are produced in the subsurface layer of landfills during the decomposition of buried waste materials. The gas is approximately made up of 60% methane (CH4) and 30% carbon dioxide (CO2), with trace amounts of other organic vapours and gases.