The article presents the results of the aerosol measurements carried out on the eastern coast of the Baltic Sea during 1986--1993. Aerosol size distributions in the diameter range of 0.01--10 μm have been measured with the electric aerosol spectrometer (EAS). A short description of EAS is given. The majority of number distributions obtained by measurements were of monomodal shape. Modal diameter varied at 0.01--0.1 μm. Seven percent of all number distributions were of bimodal shape with modes at 0.010--0.32 μm and at 0.032--0.1 μm, separated with a minimum at 0.018--0.056 μm. The majority of aerosol mass distributions were of bimodal shape and consisted of an accumulation mode varying at 0.18--1.0 μm and of a coarse particle mode at 1.8--10 μm separated by a minimum varying at 0.56--3.2 μm. Parameters of the Junge distribution and the 4-parameter KL distribution have been obtained. The variability of aerosol concentrations and the stability of aerosol at a fixed site have been studied analyzing the time sequences of aerosol number distributions. The variability of concentrations depended on particle size. The variability was about 0.7 at 0.1--0.3 μm and rose toward both the smaller and larger diameters up to values 1.4 at 0.01 μm and 1.7 at 10 μm. ¿ American Geophysical Union 1996