Hello, I'm a respiratory health specialist with a background in understanding the effects of different gases on the human body. When it comes to breathing pure oxygen, there are several factors to consider.

Breathing pure oxygen, especially at high concentrations, can be dangerous and is not typically recommended for extended periods. Here's why:


1. Oxygen Toxicity: At high concentrations, oxygen can become toxic to the body. This is because it can cause damage to the central nervous system and the lungs. Prolonged exposure to high levels of oxygen can lead to a condition called oxygen toxicity, which can manifest as symptoms like seizures, confusion, and respiratory problems.


2. Oxygen Radicals: High levels of oxygen can also lead to the production of free radicals, which are highly reactive molecules that can damage cells and tissues.


3. Fire Hazard: Pure oxygen environments are highly flammable and can increase the risk of fires.


4. Medical Use: In medical settings, oxygen is often administered at concentrations higher than what is found in the atmosphere (which is about 21% oxygen), but it is carefully regulated and monitored to avoid toxicity.


5. Duration and Concentration: The safety of breathing oxygen depends on the concentration and the duration of exposure. Short-term exposure to slightly elevated oxygen levels can be safe, but long-term exposure to high concentrations can be harmful.

In summary, while the human body requires oxygen to function, breathing pure oxygen for extended periods can lead to serious health issues. It's important to maintain a balance and ensure that the oxygen levels are within a safe range for human health.

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We breathe air that is 21 percent oxygen, and we require oxygen to live. So you might think that breathing 100 percent oxygen would be good for us -- but actually it can be harmful. So, the short answer is, pure oxygen is generally bad, and sometimes toxic. ... When you inhale, the alveoli fill with this air.read more >>