"Workers should refuse to work in any environment that depresses their blood oxygen levels below 92% SpO2."

"The closer you get to the Sun, the lower your blood oxygen levels go."

"LASER spotters were employed to visually monitor air traffic in the vicinity of the high powered LASER beam. The were typically young students and aged people that would take these temporary very high altitude jobs for some extra money. Some would become irritable as the night progressed. As far as I know, there has never been any long term monitoring of these people for health issues stemming from nighttime industrial LASER exposure or oxygen starvation."

"My memories of my time in high altitude astronomy indicate that there were no oxygen concentration monitors or alarms in the areas that liquid nitrogen was in use at the high altitude astronomical facilities where I had worked."

"An open flask of industrial liquid gas that is venting into the indoor environment should be thought of as the same as a smoldering fire, as they both create a dangerous oxygen deficient environment for the human."

"Never share an oxygen administration mask."

"It is totally nuts to take healthy sixteen year old sea level adapted children to the 13,796 feet very high altitude summit of Mauna Kea and put them on “Rx Only” prescription medical oxygen for two hours! I really hope that they acclimatize correctly, that they have pulse oximeters and doctors prescriptions to ensure that the medical prescription oxygen is administered correctly and legally."

"High altitude astronomy is a strange world of oxygen starvation, sleep deprivation and radiation sickness."

"Altitude sickness, unregulated drugs and medical gas enabled workers to become drug abusers/addicts"

"The poor persons medical oxygen supply is at sea level."