Hydrogen Sulphide occurs naturally in the earth and so people involved in oil and natural gas drilling are particularly at risk.
Hydrogen Sulphide is also produced in the breakdown of human and animal waste by bacteria and can accumulate in sewers and sewage treatment plants.
Foul odour of rotten eggs
Hydrogen sulphide is extremely toxic, preventing the brain from using oxygen which can lead to dizziness, collapse and death.
Hydrogen Sulphide cases loss of smell causing people to mistakenly think that he gas has left the space.
|0.01–0.03 ppm||Odour detectable to the human nose|
|1-20 ppm||Very strong odour, nausea, eye irritation headaches|
|20-50 ppm||Irritation in the throat and lungs – supressed sense of smell and appetite|
|100 - 200 ppm||Severe nose, throat and lung irritation|
|500 ppm||Respiratory paralysis, heart palpitations, collapse and death|
|>1000 ppm||Rapid collapse and death|
|Health||4||Can be lethal.|
|Flammability||4||Burns readily. Rapidly or completely vaporizes at atmospheric pressure and normal ambient temperature.|
|Instability||0||Normally stable, even under fire conditions|