The memory-enhancing smell
Rain’s distinct smell can also have a psychological impact. Known as petrichor, this odour rises out of the ground after a storm and is often described as pungent and earthy, yet somehow clean.
“Petrichor arises when rain releases aerosols from the ground,” says Phil Stevenson, a professor of plant chemistry at the University of Greenwich who leads work on plant and fungal traits at Kew Gardens in the UK. “During dry weather, organic molecules from plants, animals and soil accumulate on surfaces. When raindrops strike, these molecules – including volatile plant oils – are shattered into airborne particles.”
Rain’s unique fragrance means it can be a powerful nostalgia trigger
READ MORE ON THE NEXT PAGE..
