*Shinrin-yoku is a Japanese term for forest therapy, also forest “bath”.
After just a few hours in the forest, stress hormone levels drop significantly, the immune and parasympathetic nervous systems (responsible for stress reduction and relaxation) are activated, etc. One of the reasons for this is that the human immune system reacts to so-called phytoncides, chemical substances that emitted into the air by most trees, shrubs and some other plants. /https://cs.wikipedia.org/wiki/Lesn%C3%AD_terapie