* Nitrogen (N2): The most abundant gas in air, making up about 78%.

* Oxygen (O2): The second most abundant gas, making up about 21%.

* Argon (Ar): An inert gas, making up about 0.93%.

* Carbon dioxide (CO2): A greenhouse gas, making up about 0.04%.

* Other Gases: Air also contains trace amounts of other gases such as neon (Ne), helium (He), methane (CH4), krypton (Kr), hydrogen (H2), xenon (Xe), and ozone (O3).

It's important to note that the relative amounts of these gases can vary slightly depending on factors like location, altitude, and pollution levels.