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My grandfather always said that the smell of fall was ozone. This Washington Post article says that that is part of it, but also has other factors. https://archive.is/SkuVI (from https://www.washingtonpost.com/weather/2018/10/19/scent-season-explaining-aromas-fall/)

It would be interesting to compare the scent-of-fall from places that have plenty of pine trees to those that do not, or places that do wet/dry season rather than summer/winter.

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Fascinating!

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