The toxicity of medical and industrial gas to the human depends on where it is used. A gas that is regarded as safe in a well ventilated environment at sea level may be a toxic gas in an indoor environment at high altitude.
Steven Magee
altitude, astrobiology, astronomer, astronomical, astronomy, astrophysics, astrosociobiology, environment, gas, high, human, indoor, industrial, level, medical, osha, safe, sea, toxic, toxicity, ventilated