The third component to complete the smell of rain is geosmin, a metabolic by-product of certain bacteria known as actinomycetes. These bacteria release spores when the soil is dry, and these spores produce geosmin. When it rains, the spores are disturbed, and the geosmin is released into the air, contributing to that unmistakable, earthy smell. This complex network of bacterial action and chemical reactions comes together to create the scent we associate with the approach of a rainstorm.
While the combination of petrichor, ozone, and geosmin creates that signature rain scent, it’s worth mentioning that not everyone can smell these components. Our sensitivity to these smells can vary due to factors like age, genetics, and overall health. For instance, some people may detect the smell of ozone quite keenly, while others might be more attuned to geosmin’s earthy aroma. It’s a testament to human sensory perception’s incredible diversity and adaptability.
