Why Thunderstorms Smell Like That — The Answer Is Weirder Than You Think

That 'rain smell' has a name, and part of it is coming from lightning itself.

You know the smell. The sky darkens, the wind shifts, and suddenly the air smells sharp and clean and somehow electric. A viral explainer breaking down where that smell comes from has people saying they'll never experience storms the same way.

Part of it is petrichor — the earthy scent released when rain hits dry soil, produced by compounds that plants and soil microbes leave behind. Your nose is astonishingly sensitive to one of them, geosmin, able to detect it in almost comically tiny concentrations.

But the sharper, almost chlorine-like edge before a storm? That's ozone, created when lightning splits oxygen molecules in the atmosphere and they recombine in threes. Downdrafts then deliver that ozone to your nose ahead of the rain.

In other words, when you say 'smells like a storm's coming,' you're literally smelling electricity's aftermath arriving before the storm does. Your nose is a weather station. Use it wisely.