What Causes the Smell After It Rains?

What Causes the Smell After It Rains?

There are three primary sources of smells that commonly occur after rain. The first, the "clean" smell, in particular after a heavy thunderstorm, is caused by ozone. Ozone (scientifically known as trioxygen due to the fact that it is comprised of three oxygen atoms) is notably pungent and has a very sharp smell that is often described as similar to that of chlorine.

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