The decomposition of organic matters in landfills produces a significant amount of biogas. Methane (CH4) and carbon dioxide (CO2) are the two main biogas resulting from the decomposition process (combined, they represent about 95% of the biogas emitted from decomposition). Colorless, odorless and extremely flammable, CH4 and CO2 must be closely monitored in order to avoid explosions, contamination and pollution. Neglecting these toxic gases can threaten health, the environment, and populations. Gas detectors are thus more than important since they ensure a safe and efficient management of wastes and inherent vapors.