This study looked at users' perception of inter-stream synchronization between audiovisual media and two olfactory streams. The
ability to detect skews, and the perception and impact of skews on user quality of experience (QoE) is analyzed. The olfactory
streams are presented with the same skews (i.e. delay) and with variable skews (i.e. jitter and mix of scents). This paper reports the
limits beyond which de-synchronization reduces user perceived quality levels. Also a minimum gap between the presentations of
consecutive scents is identified, necessary to ensure enhanced user perceived quality. There is no evidence (not considering scent
type) that overlapping or mixing of scents increases user QoE levels for olfaction-enhanced multimedia.