Effects of the pollution plume originating from the Russian forest fires in summer 2010 on the aerosol properties in Finland were analyzed. Main properties were AOD and AE measured with Cimel and PFR sun photometers at five stations. In addition, scattering and absorption coefficient, aerosol particle number concentration and meteorological parameters were measured on the surface air. AATSR and MODIS AOD data were used to get a picture about the regional distribution of the plume. Two clear extreme periods of the AOD were observed. On 30th July, the maximum AOD was detected in Sodankylä, being 0.9 at 550 nm. A more impressive episode was between the 6th and 8th of August, when the extreme AOD of 1.5 was measured in Kuopio. In-situ observations suggest that the major part of the aerosol was residing in the well mixed layer coupled with the surface.