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Minimum 19.5% oxygen. CO2, maximum levels over an 8 hour exposure is 0.5%. 3% for 10 minute exposure.
The past 2 weeks we've had an ambulance in the plant twice from people passing out. Our manufacturing environment is consistently 20.2% and 0.2% for CO2. I just realized the meter doesn't show units. That would also be in percentages.
The Occupational Safety and Health Administration, OSHA, determined the optimal range of oxygen in the air for humans runs between 19.5 and 23.5 percent.
Serious side effects can occur if the oxygen levels drop outside the safe zone. When oxygen concentrations drop from 19.5 to 16 percent, and you engage in physical activity, your cells fail to receive the oxygen needed to function correctly. Mental functions become impaired and respiration intermittent at oxygen concentrations that drop from 10 to 14 percent; at these levels with any amount of physical activity, the body becomes exhausted. Humans won't survive with levels at 6 percent or lower.
https://sciencing.com/minimum-oxygen-concentration-human-breathing-15546.html
What OSHA standards and exposure guidelines apply? OSHA has established a Permissible Exposure Limit (PEL) for CO2 of 5,000 parts per million (ppm) (0.5% CO2 in air) averaged over an 8-hour work day (time-weighted average orTWA.) The American Conference of Governmental Industrial Hygienists (ACGIH) recommends an 8- hour TWA Threshold Limit Value (TLV) of 5,000 ppm and a Ceiling exposure limit (not to be exceeded) of 30,000 ppm for a 10-minute period. A value of 40,000 is considered immediately dangerous to life and health (IDLH value). The TLVs are intended to minimize the potential for asphyxiation and undue metabolic stress.
https://www.fsis.usda.gov/wps/wcm/c...4-9d2615f376e0/Carbon-Dioxide.pdf?MOD=AJPERES
Of course, I am vocal about how masks are causing problems, but yet I am a science denier. That above is science, the science I practice in annual confined space training and measuring air quality several times a month for the past 26 years. No one wants to listen to people who are against the masks though, because, you know, we're labeled as science deniers by those who only read one thing and are told by the MSM what science is. It's easy to be scared of what they tell you to be scared of and turn your shoulder to anything that goes against what they say and just make fun of those against the masks and call them science deniers.
You all can keep laughing at me as you do in threads all over this forum. I'm sure it makes folks feel better doing that because, you know, everyone has so much compassion and empathy, but only if you wear your mask.