The pleasant smell that we experience after rain is called "petrichor." It is a combination of two chemicals - geosmin and various oils - that are released into the air when rain hits the ground.
Geosmin is produced by certain types of bacteria and is found in soil. When raindrops hit the soil, they can disturb these bacteria, causing them to release geosmin into the air. The oils that contribute to petrichor are secreted by plants, and they can be released into the air during rain as well.
Together, geosmin and the oils combine to create the unique, fresh smell that we associate with rain. This scent can be particularly strong after a dry spell, as the oils and geosmin accumulate in the soil and are released more readily when rain finally arrives.
Additionally, the act of rain hitting the ground and stirring up the soil can also release other compounds that contribute to the overall pleasant smell we experience after a rain shower.
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