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What Causes Petrichor, the Earthy Smell After Rain?

There's often a strong, quite pleasant, smell right after a rain shower. What accounts for petrichor, the 'smell of rain'?

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What Causes Petrichor, the Earthy Smell After Rain?
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    Petrichor: What Causes the Earthy Smell After Rain?

    Petrichor: What Causes the Earthy Smell After Rain?

    Most people notice a distinctive smell in the air after it rains. It's frequently linked with spring, as the smell of fresh-cut grass is associated …

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