* Nitrogen (N2): The most abundant gas, making up about 78% of the atmosphere.

* Oxygen (O2): Essential for respiration and combustion, making up about 21% of the atmosphere.

* Argon (Ar): A noble gas, making up about 0.93% of the atmosphere.

* Carbon Dioxide (CO2): A greenhouse gas, making up about 0.04% of the atmosphere.

* Other gases: These include trace amounts of neon, helium, methane, krypton, hydrogen, xenon, and ozone.

It's important to note that the composition of air can vary slightly depending on location, altitude, and other factors.