Although mood, affect, and emotion are often used interchangeably, they are distinct concepts.
Mood is a persistent, diffuse affective state.
Emotion, on the other hand, is stronger in intensity and shorter in duration (Beege, Schneider, Nebel, Häßler, & Rey, 2018; Ulrich, 1983).
See also edit
Ulrich, R. S. (1983). Aesthetic and affective response to natural environment. In I. Altman & J. Wohlwill (Eds.), Human Behaviour and Environment (Vol. 6, pp. 85-125). New York: Plenum.