Wikipedia states, “The human nose is extremely sensitive to geosimin [the compound that we associate with the smell of rain], and is able to detect it at concentrations as low as 400 parts per trillion.” How does that compare to other scents?

It rained in Northern California last night for the first time in what feels like the entire year, so everyone is talking about loving the smell of rain right now. via /r/askscience https://ift.tt/3jXI49A