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Table of Effects of H2S Typical background concentrations Odor threshold – rotten egg smell Permissible Exposure Level – 8 Hours Possible fatigue, loss of appetite, headache, irritability, poor memory, dizziness Intense odor Above 30ppm odor is sweet or sickeningly sweet Mild Irritation - eyes, throat – 1 Hour Coughing, eye irritation, loss of smell 2-15 minute
Hydrogen sulfide - IDLH | NIOSH | CDC It has also been reported that 50 to 100 ppm causes mild conjunctivitis and respiratory irritation after 1 hour; 500 to 700 ppm may be dangerous in 0 5 to 1 hour; 700 to 1,000 ppm results in rapid unconsciousness, cessation of respiration, and death; and 1,000 to 2,000 ppm results in unconsciousness, cessation of respiration, and death in a few
Hydrogen sulfide Results - AEGL Program | US EPA Hydrogen sulfide Results - AEGL Program * Level of Odor Awareness = 0 01 ppm Hydrogen sulfide AEGL Technical Support Document (pdf) (481 67 KB) Last updated on May 14, 2025
What are H2S Exposure Limits? - Definition from Safeopedia What Does H2S Exposure Limits Mean? Hydrogen sulfide (H2S) is a highly toxic gas that can kill or seriously harm human health when exposed to it, even at low concentrations like 10 parts per million (ppm)
Chart of the Toxicity of Hydrogen Sulfide Gas - Alken-Murray Safe for 8 hours exposure May cause eye irritation Mask must be used as it damages metabolism Maximum exposure 10 minutes Kills smell in 3 to 15 minutes Causes GAS EYE and throat injury Reacts violently with dental mercury amalgam fillings severe injury to eye nerves Respiratory paralysis in 30 to 45 minutes
H2S Symptoms by Level of Exposure and What to Do High-level exposure to hydrogen sulfide presents immediate and life-threatening dangers Concentrations around 500 to 700 ppm can lead to staggering and collapse within five minutes, along with severe eye damage, with death possible within 30 to 60 minutes
H2S Exposure Chart – A Quick Way To Know H2S Toxicity H 2 S exposure chart is a chart that shows a relation between hydrogen sulfide level or concentration in the air and their effects to human health The higher the concentration, the worst the effect will be