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In this paper we present a comparative study of optical and microphysical properties of aerosols from three cities of Romania: Bucharest, Cluj Napoca and Eforie Nord. The data sets were gathered within the AERONET - Aerosol Robotic Network during 2014. The stations are located in different regions of Romania, with different geographical and meteorological conditions: various altitudes (0 - 400 m), influence of the Black Sea at Eforie Nord and different degrees of urban pollution.

For Bucharest and Cluj Napoca sites we have available data for the entire year, for Eforie Nord site the data are available only from June to December. We analyzed both Direct Sun measurements like Aerosol Optical Thickness (AOT) and Angstrom Parameter (alpha) and inversion data products like fine and coarse volume concentration (C-Vc and C-Vf), single scattering albedo (SSA(lambda)) and real part of refractive index (n). The aerosol optical thickness (AOT at 440 nm) of the studied area is characterized by yearly mean values ranging from 0,23 at Cluj Napoca to 0,28 at the Bucharest site. Regarding the Angstrom parameter, we observed the predominance of high values, specific to urban-industrial aerosols. Regarding the volume particle size distribution, the fine mode is dominant through the entire year with exceptions due to desert dust intrusions during the spring and autumn.