Smell the rain?

I came across this picture today:


It's called Le Manege de Monsieur Barre, by Robert Doisneau and when I saw it, I was almost transported onto the square. Even though it's in black and white.
I'm almost sure I can hear the rain coming down on the merry-go-round. It must have been one of those sudden French rains that you never see coming. An hour later, the sun would be back and people would start popping out of their hiding places.

You can practically see the water run towards the drain on the right, and then there's that smell...

I had to know what that rain smell was, and Google gave me this:

"There are two main smells associated with rain. The first is ozone which can be produced by lightning. This has an acrid smell. The common rain smell is a gas called petrichor. Volatiles evaporate from plants and are absorbed by rocks, concrete etc. When the rain hits the rock, the volatiles are released into the atmosphere and you smell it. This is a clean fresh smell.

So there: Petrichor is your word of the day.