Sewer gas Sewer gas Sewer gas is a complex mixture of toxic and nontoxic gases produced and collected in sewage systems by the decomposition of organic household or industrial wastes, typical components of sewage. Sewer gases may include hydrogen sulfide, ammonia, methane, esters, carbon monoxide, sulfur dioxide and nitrogen oxides. Improper disposal of petroleum products such as gasoline and mineral spirits contribute to sewer gas hazards. Sewer gases are of concern due to their odor, health effects, and potential for creating fire or explosions. Sewer gas is typically restricted from entering buildings through plumbing traps that create a water seal at potential
2012 Jersey gas holder fire gas leak on the side of the holder", who were using electric tools. During this, the leaking gas ignited. The fire spread and "attacked" the joints of the holder, which caused more gas to leak out and ignite, resulting in a larger and more intense fire. Furthermore, Jersey Gas admitted to not carrying out risk assessments, not providing "a safe system of work" and providing inadequate health and safety training to its employees. An area of St Helier was evacuated and cordoned off soon after the fire started. Seven near-by schools were also evacuated. Many residents who live in houses