Here's why:

* Solutions involve a solute (substance being dissolved) and a solvent (substance doing the dissolving).

* Air is a mixture of gases, primarily nitrogen (78%), oxygen (21%), and other gases in smaller amounts. There's no single component that acts as a solvent for the others.

Instead of a solvent, think of air as a homogeneous mixture, meaning its composition is uniform throughout. The different gases are dispersed evenly, not dissolved in one another.

Let me know if you have any other questions!