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

Steven Magee Altitude Astrobiology Astronomer Astronomical Astronomy Astrophysics Astrosociobiology Environment Gas High Human Indoor Industrial Level Medical Osha Safe Sea Toxic Toxicity Ventilated