You step outside, sniff the air, and say: "It's going to rain." You're not psychic. You're just smelling the storm before it gets here.
That clean, sweet, almost electric tang is ozone. Lightning splits oxygen atoms, which recombine into O₃, carried down by wind. Then there's petrichor - the earthy scent of plant oils released by dry soil after a long dry spell. And geosmin, produced by bacteria in damp earth. These three scents ride the breeze ahead of the raindrops.
So when your nose twitches on a summer afternoon, trust it. The sky is sending a telegram, and you just learned how to read it.
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