Two-dimensional variance analysis of the results of determination of NO3-, SO42-, F-, Al3+, Cl-, NH4+, PO43-, Fe3+, Ca2+, K+ and Mg2+, and pH and electrolytic conductivity of precipitation water samples collected in the Tricity area, showed that transregional transport of pollutants affects air quality in this region. Over the large area of the Tricity agglomeration fluctuations in analytes concentrations in precipitation water samples are not affected on statistically significant level by localization of sampling sites but they area affected by transport direction of air masses movement.