The Arctic environment is under high pressure as the atmospheric temperature is increasing with about twice the rate compared to the rest of the world. It is assumed that one of the major reasons for these observed changes is atmospheric pollution that is transported from other parts of the world to the high Arctic areas. Long-range transported Arctic aerosols build up the so-called Arctic haze and may have substantial impact on the net radiation budget in the Arctic. Therefore it is necessary to determine the microphysical parameters of observed aerosols in this sensitive area. A small overview over previous activities at Villum Research Station (VRS) at Station Nord (SN) in North Greenland will be given.