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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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