* Nitrogen (N2): About 78%

* Oxygen (O2): About 21%

These two gases make up the vast majority of the atmosphere.

The remaining 1% is made up of other gases, including:

* Argon (Ar): About 0.93%

* Carbon dioxide (CO2): About 0.04%

* Neon (Ne), Helium (He), Krypton (Kr), Xenon (Xe), Hydrogen (H2), Ozone (O3): Trace amounts

It's important to note that the percentages can fluctuate slightly depending on location and altitude.