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Landfill gases are a significant concern in modern waste management, particularly in the context of sanitary landfills designed for the disposal of municipal solid waste. These gases are primarily produced through the microbial decomposition of organic matter in waste under anaerobic (oxygen-free) conditions. The most common components of landfill gas include methane (CH₄), carbon dioxide (CO₂), nitrogen (N₂), oxygen (O₂), and trace amounts of volatile organic compounds (VOCs), hydrogen sulfide (H₂S), and other gases. While landfills serve as a practical solution for solid waste disposal, the gases they emit pose a variety of hazards to human health, the environment, and safety. One of the primary concerns of landfill gases is their potential to cause explosions and fires. Methane, a highly flammable gas, can accumulate in the landfill or migrate into nearby buildings, especially when the landfill is poorly designed or lacks adequate gas venting systems. When methane concentrations in the air reach between 5% and 15%, the gas becomes explosive, representing a severe risk to both workers and residents living near the landfill site. Historical incidents have demonstrated that improper management of landfill gas can result in catastrophic explosions, property damage, and loss of life. The risk is amplified in older landfills where waste compaction and gas collection systems are not robust. Beyond the physical hazards of explosion and fire, landfill gases create significant environmental and health hazards through air pollution. Methane is a potent greenhouse gas with a global warming potential approximately 28–36 times greater than that of carbon dioxide over a 100-year period. Uncontrolled release of methane contributes directly to climate change, which in turn indirectly affects human health through ____ _______ ____ ____ __________ _______ _____ ____ _________ _______ _______.
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