We've been runners for many, many years, and with all those miles comes getting caught in some crazy weather. You can tell the rain is headed towards you by your nose and that sweet and pungent smell. That aroma is the ozone that is driven down from higher elevations. The origin of the word "ozone" comes from the Greek word, “ozein” which means “smell". There are two other aromas you can pick up as the rain continues, petrichor and geosmin, which you can read about at the link below.
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