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In the international context of incomplete information on air pollution in East Europe, we made a review–image of the air pollution problem in Bucharest metropolitan area, Romania, by assessing concentrations, variability, and compliance with the EU regulations of the primary pollutant levels (PM₁₀, PM_2.5, SO₂, CO, and NO_x) from eight sampling stations for six years of continuous sampling (2005–2010) and analyzing for factors affecting the seasonal and spatial variations of PM levels. Investigation of temporal and spatial variation of PM₁₀ and PM_2.5 concentrations, as well as their relationships with the measured gaseous air pollutants and with meteorological variables includes correlation analysis, trend analysis, multiple linear regression analysis, and atmospheric back–trajectory analysis. Starting with systematic exceedances of the limit values in 2005 for PM₁₀ and NO_x, we observed negative trends for all …