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Gases Dangerous Concentration Levels

Dangerous and tolerable levels of industrial gases

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GasGas Concentration (0/00)
Tolerable > 1 hourTolerable < 1 hourImmediately Dangerous
Ammonia 0.1 0.3 3.5
Bromine Vapor 0.001 0.004 0.05
Carbon Dioxide 10 30 40
Carbon Monoxide 0.2 0.5 2.0
Chlorine Vapor 0.001 0.004 0.05
Hydrochloric Acid 0.01 0.05 1.5
Hydrogen Sulphide 0.2 0.6
Iodine Vapor 0.0005 0.003 0.05
Sulphuric Acid 0.05 0.5
  • 1 ppm = 10-6 = 0.0001 o/o = 0.001 o/oo
  • o/oo  = 1000 ppm 
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  • en: gases dangerous levels accumulation harmful
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