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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 – 0.032 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.

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