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SCIENCE
Physical - Chemistry
Most Common Elements in the Earth's Atmosphere
This list features the most common elements in the Earth’s atmosphere.
RANK | ELEMENT | CONTENT % |
1 | Nitrogen (N₂) | 78.084% |
2 | Oxygen (O₂) | 20.946% |
3 | Argon (Ar) | 0.934% |
4 | Carbon dioxide (CO₂) | 0.042% |
5 | Neon (Ne) | 18.182 parts per million |
6 | Helium (He) | 5.24 parts per million |
7 | Methane (CH₄) | 1.92 parts per million |
8 | Krypton (Kr) | 1.14 parts per million |
9 | Hydrogen (H₂) | 0.55 parts per million |
10 | Nitrous oxide (N₂O) | 0.33 parts per million |
11 | Carbon monoxide (CO) | 0.10 parts per million |
12 | Xenon (Xe) | 0.09 parts per million |
13 | Ozone (O₃) | 0.07 parts per million |
14 | Nitrogen dioxide (NO₂) | 0.02 parts per million |
15 | Iodine (I₂) | 0.01 parts per million |
16 | Ammonia (NH₃) | trace |
References
NOAA (2023). The atmosphere. Available at: https://www.noaa.gov/jetstream/atmosphere [Accessed 1 December 2025].
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