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Or even soil.
I tried to find an example, but I browsed dozens of scents yesterday on several sites and I can't find it now.
It's not a big deal, it just seemed silly to use dirt to describe a...

No, just some products give an online scent description that includes the use of the word dirt to describe the smell.

I've seen it a couple of times now, a scent described as reflecting moist or wet "dirt". I wonder why they don't have the semantic intelligence to use "earth" instead. It makes a huge difference.