The Science of Smelling Rain

Did you know you can smell a storm before the first drop falls?

This earthy scent is called petrichor. It is released when rain hits dry soil.

The rain traps air bubbles in the earth. When they pop, they spray aerosols.

Lightning also plays a role. It splits nitrogen and oxygen molecules to create ozone.

Humans are sensitive to these scents. We detect them at incredibly low concentrations.

Your nose is a natural early warning system. Trust your senses.