Temperature can affect the amount of smell-carrying gas particles :: Now Smell This

“If you go to a forest, you have a given environment and temperature. If that temperature goes a little bit high, you change the profile of the chemical components in the air,” since temperature can affect the amount of smell-carrying gas particles released from substances, explains Idelfonso Nogueira, a chemical engineer who leads the SCENTinel Project to preserve olfactory landscapes. “And therefore, you change the perception of how the forest smells.”

— Read more in Earth’s Smells Are Disappearing Because of Climate Change, and It’s a Vast Cultural Loss at Smithsonian Magazine.