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
Pearse Street fire a farther hydrant. While they waited, two explosions were caused by the fire igniting cylinders of coal gas and oxygen stored at No.163 by a company which manufactured car batteries. This engulfed the three men and strengthened the blaze, which burned itself out the following morning. The bodies of the firemen were recovered that evening; they had died of carbon monoxide poisoning. A tribunal of inquiry was established by order of the Oireachtas, which criticised the fire brigade supervisors, the water company, and the battery company. The cause of the initial fire was not established; the inquiry ruled out arson