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The article presents the diversity and changes in the emission of typical pollutant gases: CO, SOx and NOx in the selected European Union countries in the years 1995-2010. This process was determined to be diverse both in time and space. There was an evident decrease in the total emission of the above-mentioned pollutants also in some countries with a dynamics higher in the years 1995-2000 than in the first decade of the 21st century. The highest actual emission of the analyzed pollutants took place in Poland, Bulgaria and Romania, with the lowest values in Slovenia, Estonia, Lithuania and Latvia. In the years 1995-2010, the disproportions between the countries in the spatial diversification of air pollution emission considerably diminished. One of the consequences of the decline in the air pollution emission is an improvement of air quality in numerous urbanized and industrialized areas in the research countries. [ABSTRACT FROM AUTHOR]