Aerosol optical depth (AOD) has been retrieved over Finland, using the dual-view Advanced Along Track Scanning Radiometer (AATSR). The results are in good agreement with ground-based measurements. The background AOD value over Finland is very low and is about 0.06-0.08. AOD is higher in the air masses arrived to Southern Finland from Russia (0.33) and Central Europe (0.20); in air masses originating over the North Atlantic and the Arctic, AOD is lover than 0.12 (for cases when the retrieval was not limited by the low solar zenith angle or cloudiness).