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
2014 Kaohsiung gas explosions neighborhoods. One resident claimed that he had notified city authorities prior to the explosion when he smelled a gas odor near his apartment. However, authorities told him that the situation was under control and had been declared safe after police and firefighters arrived at the scene. Kaohsiung city authorities responded to these criticisms by saying that had residents been evacuated prior to the explosions, there may have been even more fatalities, since most of the injured or dead were those on the roads at the time of the incidents. According to Taipower, staying indoors was the best precaution that could