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The ultimate source of the smell of rain is a population of soil bacteria known as actinobacteria. When the air becomes humid just as rainfall begins, those microbes get busy & produce aromatic geosmin as a byproduct.
https://theconversation.com/why-you-can-smell-rain-101507 #smell #senses
Photo of a rainstorm as it begins to hit the ground, activating the bacteria that produce the distinctive "smell of rain."

Why you can smell rain

A weather expert explains where petrichor – that pleasant, earthy scent that accompanies a storm’s first raindrops – comes from.
The Conversation
#smell #senses

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