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Landfills are a major contributing source of pollution, including emissions of hydrogen sulfide (H2S) and methane (CH4). Landfill gases are a natural byproduct of the decomposition of organic matter by bacteria. The two main gases produced through anaerobic decomposition are CH4 and carbon dioxide (CO2); ammonia (NH3), H2S and a few other gases are also produced at lower concentrations. Methane makes up around 50% of landfill gas emissions. As such, it is important to monitor CH4 levels at landfills, as it is a much more potent greenhouse gas than CO2. LasIR analyzers can be used in combination with open path optics to monitor CH4, CO2, H2S and NH3 emissions with high accuracy for paths of up to 1 km.

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