A slow death by progressive Hyperoxia.
You've got 32.3% Partial Atmospheric pressure of O2 which is good.
The ATM of 36.8% (equal to 37287.6 Pascal) is like being at 25,000 altitude.
Your air temperature is -89.435C.
Oxygen toxicity must be minimized by keeping a partial pressure arterial oxygen of O2 less than 80 mm Hg of pressure AND the fraction of O2 you breathe in (inspired) below 40% to 50%. The first signs of Oxygen toxicity may include disorientation, respiratory problems, or myopia. Then you will experience irritation to the lungs, congestion and edema of the lungs. Soon seizures and convulsions with central nervous system toxicity (CNS) lead to death.
The human body has naturally occurring antioxidants to combat reactive Oxygen molecules in the atmosphere that we breathe in, but the protective antioxidant defenses can become depleted by abundant reactive Oxygen species (ROS), resulting in oxidation of the tissues and organs. Studies have shown oxygen higher than 21% can be damaging to biological tissues, damaging lipids, proteins, and nucleic acids. You've got 32.3%. Activated alveolar capillary endothelium is characterized by increased adhesiveness causing accumulation of cell populations such as neutrophils. Hyperpermeability of the pulmonary microvasculature causes flooding of the alveolus with plasma extravasations leading to pulmonary edema and abnormalities in the coagulation and fibrinolysis pathways promoting fibrin deposition.
Reduction of oxidation: A single-electron transfer converts molecular oxygen to the superoxide anion, creating an unstable molecule. The decomposition of hydrogen peroxide can be a source of the hydroxyl radical; this reaction requires both superoxide and hydrogen peroxide as precursors. These steps reduce oxygen to water by the addition of four electrons, yielding three reactive oxygen species: superoxide anion, hydrogen peroxide, and hydroxyl radical.
Fraction of inspired oxygen (FiO2) is the fraction or percentage of oxygen in the volume being measured, like a planet's atmosphere. Medical patients experiencing difficulty breathing are provided with oxygen-enriched air, which means a higher-than-atmospheric FiO2. Natural air includes 21% oxygen, which is equivalent to FiO2 of 0.21. Oxygen-enriched air has a higher FiO2 than 0.21; up to 1.00 which means 100% oxygen. FiO2 is typically maintained below 50% even with mechanical ventilation, to avoid oxygen toxicity. If a patient is wearing a nasal cannula or a simple face mask, each additional liter per minute of oxygen adds about 4 percentage points for the first 3 liters and only 3 percentage point for every liter thereafter to their FiO2 (for example, a patient with a nasal cannula with 4L/min of oxygen flow would have an FIO2 of 21% + (3 x 4%)+(1 x 3%) = 36%).
Exposure time, atmospheric pressure, and fraction of inspired O2 determine the cumulative O2 dose leading to toxicity. Oxygen is toxic to the lungs when high (>60%) and administered over extended exposure time (≥24 hours) at normal barometric pressure (1 atmospheres absolute (ATA)). This type of exposure is referred to as low pressure O2 poisoning, pulmonary toxicity, or the Lorraine Smith effect.
Toxicity also occurs when the ATA is high (1.6–4) and the high O2 exposure time is short. This type of exposure is referred to as high pressure O2 poisoning or the Paul Bert effect and is toxic to the central nervous system (CNS). Central nervous system toxicity results in seizures, followed by coma in most people within 30 to 60 minutes. Seizures often occur without warning and are likely to be lethal. Other symptoms include nausea, muscle twitching, dizziness, disturbances of vision, irritability, and disorientation.
PaO2/FiO2 ratio. The ratio of partial pressure arterial oxygen (in the blood stream) and fraction of inspired oxygen, sometimes called the Carrico index, is a comparison between the oxygen level in the blood and the oxygen concentration that is breathed. A PaO2/FiO2 ratio less than or equal to 200 is necessary for the diagnosis of acute respiratory distress syndrome. A PaO2/FiO2 ratio less than or equal to 250 is one of the minor criteria for severe community acquired pneumonia.
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So, we want to know if there is too much or too little oxygen in the air to survive on your planet.
Is there too much to cause hyperoxia? (when tissues and organs are exposed to an excess supply of oxygen)
Or is there too little to cause hypoxemia? (low oxygen in your blood) and causes hypoxia (low oxygen in your tissues) when your blood doesn't carry enough oxygen to your tissues.
All we need to know is how much oxygen is in your blood, not just how much is in the air. Or basically the number on the Carrico index.
We know the FIO2 on your planet, that is the same as the absolute atmospheric pressure of oxygen, or .878
Finding out the PaO2 or how much oxygen is in your blood on your planet at sea level:
Simple method:
Alveolar air (PaO2) is the oxygen exhaled minus the oxygen inhaled times the VD/VT all of which is divided by 1-VD/VT
Physiologic dead space over tidal volume (VD/VT) is the CO2 in your blood minus what you exhale divided by what you exhale
These are all partial pressures of oxygen in alveolar, expired, and inspired gas.
Detailed method:
Alveolar air (PaO2) is the fraction of inspired oxygen times the barometric pressure, not including pressure from water vapor
minus the partial pressure of alveolar CO2 times the fraction of inspired oxygen plus 1 minus fraction of inspired oxygen over the Respiratory quotient
The Respiratory quotient is the partial pressure of alveolar CO2 times 1 minus the fraction of inspired oxygen all divided by O2 breathed in minus O2 breathed out minus the CO2 breathed out time the fraction of of inspired oxygen
Now I will attempt that thing called Maths.
First, your planet is a dry desert. There is no water vapor. On Earth is normal .02302 ATM. Second we need to know barometric pressure (weight of the air) at sea level. That is simply 0.372876 bar or 37287.6 Pascal. Normal barometric pressure on Earth at sea level is 101325 Pascal. On your planet sea level is the same as 5857.60 meters above sea level on Earth.
This link has a calculator for finding the air pressure for any planet's atmosphere based on temperature and altitude.
Interplanetary Air Pressure at Altitude Calculator
This link gives us info on partial gas pressures normally inside the lungs and blood.
Human Physiology - Respiration
Alveoli (entering) CO2 is around 40 mm Hg (0.0526316 ATM) on Earth.
Since your planet's CO2 partial pressure is .0445, nearly the same as Earth's, I wont change it for this formula.
Alveolar (exiting) CO2 is around 45 mm Hg (0.0592105 ATM) Relatively high because the blood returning from the systemic circulation has picked up carbon dioxide.
Alveoli (entering) O2 is around 100 mm Hg (0.13157894 ATM) on Earth. On your planet it would be 0.20238 ATM at .323 partial
Alveolar (exiting) O2 is around 40 mm Hg (0.0526316 ATM)
Alveolar air (PaO2) oxygen in your blood is:
x = 0.878 * (0.372876 - 0) - 0.0592105 * (0.878 + [1 - 0.878 over R]
while R = 0.0592105 - (1 - 0.878) all over 0.20238 - 0.0526316 - (0.0592105 * .878)
so
x = 0.273896094653844 ATM or 208 mm Hg
That is double the recommended maximum amount for people using oxygen therapy for COPD
Normally PaO2, the percentage of oxygen in your blood, on Earth is 0.1052631 ATM or slightly greater than 80 mm Hg
That is double the recommended maximum amount for people using oxygen therapy for COPD
Using this calculator we get a Carrico index value of over 64,000 !
PaO2/FiO2 ratio calculator
While the partial pressure of oxygen is low because of the thin atmosphere 32.3%, most of it is oxygen 87.8%.
You would be getting way too much with each breath and it would be too saturated or rich, as they say.
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Or I could be completely wrong and have no clue what I just typed. Actually, I hope I am wrong lol
Either way, that planet you found is simply amazing. I am totally thrilled you found it.