Fun fact: That smell is almost entirely different among various geographical biomes, depending on soil type and fauna. Deciduous regions smell more earthy and mellow than coniferous ones; but the latter have a unique clean air quality and piney scent. The South has a much different smell than the Pacific NW or Northeast.
The areas in and surrounding the Sonoran/Mojave deserts are radically different thanks mostly in part to the creosote bush. During the wet seasons, the Southwest has a chemically "clean" smell that is strangely intoxicating and makes me feel like I'm having a stroke. I simultaneously love and hate it.
People that spend their lives living with the same few hundred square miles will never experience these differences.
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