The most authoritative answer in 2024
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Scarlett Brown——Studied at the University of Cambridge, Lives in Cambridge, UK.
Hello, I'm an expert in environmental science with a focus on atmospheric conditions. When discussing the composition of the air, it's important to understand that the Earth's atmosphere is a complex mixture of various gases.
The normal oxygen level in the air, specifically referring to the Earth's atmosphere, is approximately 21%. This percentage is a vital component for the survival of most living organisms, as oxygen is essential for cellular respiration. The atmospheric oxygen level can vary slightly due to natural processes and human activities, but it generally remains around this figure.
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Lucas Rodriguez——Works at the International Development Association, Lives in Washington, D.C., USA.
By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.read more >>
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