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What is that characteristic smell of rain?

Asked by Joe_Freeman (504points) June 16th, 2009

When rain first starts falling, if it hasn’t rained in a while, there is a characteristic “fresh” smell that is immediately detectable. What is that smell, and why does it go away after the rain has been falling for some time?

I live in Southern California; I don’t recall if I’ve detected the smell in other places.

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