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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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Physiology - Human physiology, air quality and comfort temperatures, activity and metabolic rates, health effects of carbon monoxide and more
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en: gases dangerous levels accumulation harmful

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