Elemental composition of different air masses over Jeju Island, South Korea

► Five types of air masses were categorized during 5 years observation period. ► Seasonal and eventual (e.g. dust) elemental variation was a major variability. ► High non-sea-salt sulphur in the type II-1 air mass (the eastern China region). ► Association of nss-S with V and Ni in aerosols from eastern China and South Korea.