There is no better smell then the smell of Arizona after it rains. Did you know that there is actually science behind the reason that rain smells so great?

While some scientists believe that our love of the scent of rain is actually rooted in our ancestors who relied on rainy weather for survival, there is also a chemical reaction that is responsible for the beloved scent.

The distinctive smell suggestive of chlorine that you may smell during a thunderstorm is caused by the lightning splitting oxygen and nitrogen molecules in the atmosphere causing them to recombine into nitric oxide. This “scent of rain” is called ozone.

The other scent called “petrichor,” is caused by chemicals produced by a soil-dwelling bacteria combined with oils that are secreted from plants during prolonged dry periods creating the chemical compound you smell when the rain hits the ground.

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