９９７年８月某单位发生了一起因疏通生活污水管道引起的硫化氢气体急性中毒故事，现将调查结果报告如下。１事故发生经过王某因未进行通风和未戴任何防护用具下到井内疏通清除生活污水管道，致使下井约１０分钟左右感胸闷、气短；１小时后再次下井内约１分钟时突然跌倒。... In August 997, a unit involved in an acute poisoning of hydrogen sulfide gas caused by dredging of domestic sewage pipelines, the results of which are reported below. An accident occurred after Wang did not carry out ventilation and did not wear any protective gear to the well to clear the domestic sewage pipe, resulting in about 10 minutes down the well feeling chest tightness, shortness of breath; 1 hour after the wells went down about 1 minute suddenly fell. ...