The effects of oxygen concentration on the human body

At atmospheric pressure, oxygen poisoning may occur when the oxygen concentration exceeds 40%. When inhaling 40%-60% oxygen, discomfort behind the sternum and mild coughing occur, followed by chest tightness, a burning sensation behind the sternum, and difficulty breathing, with the cough worsening ； Severe punishment can lead to pulmonary edema, and even respiratory distress syndrome. When the oxygen concentration inhaled is above 80%, facial muscle twitching, pale complexion, dizziness, tachycardia, and collapse occur, followed by severe convulsions throughout the body, coma, respiratory failure, and death. Prolonged exposure to an oxygen partial pressure of 60–100 KPa (corresponding to an inspired oxygen concentration of about 40%) can cause eye damage, and in severe cases, blindness may occur. It is recommended that emergency responders wear self-contained positive-pressure breathing apparatus and standard work clothing. Avoid contact with combustible or flammable materials. Seal the source of leakage as much as possible. Ensure proper ventilation to enhance diffusion. Generally, we consider an environment to be oxygen-rich when the oxygen concentration is above 23%, and oxygen-poor when it is below 19%. Set up detection alarms. The figures above are for reference only.

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This is all I could find online; I’m not sure if it’s correct. Effects of oxygen concentration on the human body: Oxygen concentration (%), effects and implications. 65-85: Effective for recovering from intense exercise (in the short term); risk of aerobic poisoning (over a long period). 50-60: Concentration that maximizes athletic performance (in the short term). 35-50: Effective for recovering from mild exercise (in the short term); risk of aerobic poisoning (over a long period). 21-30: An increase in oxygen concentration enhances athletic performance; athletic performance increases by 10% at an oxygen concentration of 30%. 20.9: Standard oxygen concentration in the atmosphere. 20.5: Reference value for ventilation volume according to construction regulations. 19-20: Increased CO levels due to incomplete combustion, causing discomfort. 18.0: Minimum value per occupational safety and health standards. 15-16: Hypoxia leads to an increased breathing rate. 13-15: Oil lamps go out. 12.0: Dangerous in the short term. 7.0: Death

19.5–23.5% = Normal oxygen concentration. 15–19% = Reduced working capacity, feeling of exertion. 12–14% = Rapid breathing, increased pulse rate, decreased coordination and judgment skills. 10–12% = Weakened breathing, blue lips. 8–10% = Confusion, fainting, grayish complexion, nausea and vomiting. 6–8%: If it lasts more than 8 minutes, death is certain; 6 minutes indicates a 50% chance of death; 4–5 minutes suggests a possibility of recovery. 4–6% = Loss of consciousness within 40 seconds, convulsions, cessation of breathing, and death.

Agree with what was said on the 2nd floor! The answers from the people below are all off-topic! Everyone knows that lack of oxygen can be fatal. But when building an liquid oxygen station, it is essential to consider the dangers in an oxygen-rich environment! Be sure to use an alarm device!