Hydrogen sulfide has strong toxicity, irritates human eye membranes and respiratory system, hinders the oxidizing process of human body, and makes the human body lack of oxygen. When the concentration of hydrogen sulfide in the air reaches 0.0001%, the human sense of smell can smell the odor; hydrogen sulfide concentration reaches 0.0005%, in a few hours after the occurrence of mild poisoning, serious saliva and clear nose, breathing difficulties; hydrogen sulfide concentration reaches 0.02%, people will be severely poisoned, dizziness, headache, vomiting and limb weakness; hydrogen sulfide concentration reaches 0.05%, people will soon When the concentration of hydrogen sulfide reaches 0.05%, a person will quickly lose consciousness and have spasms, and if not rescued in time, there will be a danger of death; when the concentration of hydrogen sulfide reaches 0.1%, a person will die in a very short time. Coal Mine Safety Regulations stipulate that the maximum allowable concentration of hydrogen sulfide in mine air is 0.00066%. This article only represents the author's personal views, and has nothing to do with China Coal Mine Safety Network. Its originality as well as the text and content of the text statement has not been confirmed by this site, this article and all or part of the content, the authenticity of the text, completeness, timeliness of this site does not make any guarantee or commitment, readers are invited to make reference only, and please verify the relevant content on their own.