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Gases - Dangerous Levels

Dangerous and tolerable levels of industrial gases

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Gas	Gas Concentration (⁰/₀₀)
Gas	Tolerable > 1 hour	Tolerable < 1 hour	Immediately 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
1 ^o/_oo = 1000 ppm

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en: gases dangerous levels accumulation harmful

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