There’s a word for it: the smell of rain

LONDON, ENGLAND - JANUARY 18:  A mobile device...

Petrichor  is the scent of rain on dry earth. The word is constructed from Greek, petra, meaning stone + ichor, the fluid that flows in the veins of the gods in Greek mythology.

The term was coined in 1964 by two Australian researchers, Bear and Thomas, for an article in the journal Nature.[1] In the article, the authors describe how the smell derives from an oil exuded by certain plants during dry periods, whereupon it is absorbed by clay-based soils and rocks. During rain, the oil is released into the air along with another compound, geosmin, a metabolic by-product of bacteria, which is emitted by wet soil, producing the distinctive scent; ozone may also be present if there is lightning.”  (Wikipedia)

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