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What causes the smell after rain?"

What causes the 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 with summer. You'll find it in a lot of poetry and also on many inspirational lists of things to be happy about. But what causes it? As it turns out, the smells people associate with rainstorms can be caused by a number of things. One of the more pleasant rain smells, the one we often notice in the woods, is actually caused by bacteria! Another sort of smell is caused by the acidity of rain. Another after-the-rain smell comes from volatile oils that plants and trees release. These are a few common rain smells, but there are also all sorts of other scents after it rains.

http://science.howstuffworks.com/nature/climate-weather/atmospheric/question479.htm

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