Gases like Nitrogen are commonly used in cryogenic applications in hospitals and clinics for preservation of tissues, embryos and blood. Wherever these gases are used and stored staff are potentially at risk. A leak of an inert gas results in Oxygen depletion of the atmosphere and should such leaks occur people could die.
Cryogenic gases are odourless and colourless, they cannot be detected by the human senses and you cannot be 100% sure there is no gas leak unless you have installed a monitoring system.
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