What Is the Secret Behind the Good Smell After the Rain?

What is the secret behind the good smell after it rains? What makes rain smell so good? when we were children we used to play outside during and after the rain. We noticed that the soil gives a good smelling scent. It is a very pleasant nice aroma. The whole world is happy and optimistic when it rains. Is there any scientific background about it? Superstition may play a role here. I heard that our ancestors used to expect a profitable season after it rains.   

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Eu tambien amiga Silvana. I like the smell of the rain too. Thanks for your comment. 

it happens because of air is saturated with ozone)

Absolutno uchitel Robert! Thanks for your logical explanation. Once more, I hope to be one of your friends. Thank you.

After reading this post, I was driving from Central Australia to South Australia, a 1,500 km journey through barren country. While driving it began to rain just after we left the Northern Territory border and entered South Australia. I could smell the earth. I asked my wife why we smell it and what causes it and she simply said that it's the smell of the earth caused by the evaporation of the rain on the earth.

She's smarter than me - so she thinks - so I accepted her opinion. Whatever causes it, it is a pleasant smell and tells us that somewhere nearby it's raining.
That smell is called "petrichor", sir.

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