Ozone notes refer to the scent of the air. They are often treated the same as marine notes, but marine notes refer to synthetic fragrances such as dimetol and dihydromyrcenol, while ozone notes often refer to fragrances that use calon, melon, and floralozon. These ozone note fragrances have a refreshing and slightly melon-like scent. The scent before rain, called petrichor, is also included in this ozone note.