Introduction Landfill gas is a mixture of a number of gases typically containing 45-60% Methane. Global methane emissions from Landfill sites are estimated to be in the region of 30—70 million tonnes each year placing Landfills as one of the largest sources of human related methane emissions in the world. In addition to the environmental impact of this gas, there is also an explosion risk of gas migrating off site and collecting in enclosed spaces such as basements and sub- terranean voids. OptoSci have carried out extensive field trials in the landfill environment verifying both the robust operating characteristics of OptoSniff® and the benefits to the landfill operator. Project OptoSci installed a 54 point OptoSniff® system to monitor both the landfill perim

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