Geosmin (Rain smell)

You have smelled geosmin before. Geosmin is the smell you smell when it starts raining. It is said that humans are incredibly sensitive to the smell of geosmin, at a parts-per-trillion level.

Explainer: How bacteria give rain its unique scent
Edible Experiments – Earth’s Perfume
Geosmin – Why Humans Can Smell Better Than Sharks
What Causes the Smell After Rain?

Petrichor

Where Does the Smell of Rain Come From?
Why Does Rain Smell So Good?

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