Where Does the Smell of Rain Come From?

The smell of rain comes from tiny particles that are released when water hits the ground.

When it rains, the drops hit things like dirt, grass, and rocks. This makes a little dust or mud rise into the air, just like when you kick up dirt while playing outside. This dust has special tiny bits inside it called chemicals, which are like invisible flavors.

When these chemicals float up, they go into your nose. Your nose is like a detective that can tell what’s in the air. When the detective smells those special chemicals, you get that fresh, clean smell, sometimes people call it petrichor, but that's just a fancy name for the rain smell.

It's kind of like when you open up a new toy box and smell the happy, new-to-you toys inside. The rain is opening up the earth’s toy box!