However, the air we breathe on Earth is composed primarily of:
* Nitrogen (N2): About 78% of the atmosphere.
* Oxygen (O2): About 21% of the atmosphere. This is what we breathe to survive.
* Argon (Ar): About 0.93% of the atmosphere.
* Carbon Dioxide (CO2): About 0.04% of the atmosphere. This is a greenhouse gas and has been increasing in recent years.
There are also trace amounts of other gases, including:
* Neon (Ne)
* Helium (He)
* Methane (CH4)
* Krypton (Kr)
* Hydrogen (H2)
* Ozone (O3)
* Xenon (Xe)
* Water vapor (H2O)
The composition of air can vary slightly depending on location, altitude, and other factors.
