he subject of the research that led to graduate thesis is the analysis of the affect that Oil Refinery Brod cause on the quality of life in Slavonski Brod. Slavonski Brod is situated in Croatia, on the bank of river Sava, in Brodsko-posavska county, and according to the population register from 2011, it had 59 141 inhabitants. On th eother side of river Sava town Brod is situated in Bosniaand Hercegovina in whose territory Oil Rafinery Brod is located. For many years inhabitants of Slavonski Brod have been alarming abou tpolluted air caused by the refinery, but without any particular effect since the cause of the pollution is situated in the other country. The main goa was to find out whether the mentioned rafinery has the affect on the quality of life for the inhabitants of Slavonski Brod, and to what extent. The studied literature is connected to the term "quality of life". Air pollutants were also analyzed and their affect on the human health. During the research, air pollution datas for Slavonski Brod, available on the pages of Croatian Environment and Nature Agency, were used. Air saturation in Slavonski Brod is analyzed and how high the pollutant concentration is according to the legally permitted quantities. Measured pollution from measuring stations Slavonski Brod I and Slavonski Brod II were compared and analyzed due to the season, and the windage. Also, the survey determined the attitude of citizens about the quality of life in Slavonski Brod and to what extend Oil Refinery Brod has an impact on it. The analysis of available datas and processed surveys among the inhabitants, led to the conclusion that Oil Refinery Brod is a great air pollutant in Slavonski Brod. Apart from the refinery, during the winter months, the pollution is also increased by the wood fireboxes and wind absence. Inhabitants in Slavonski Brod are extremely dissatisfied with Oil Refinery Brod and think that its work decreases the quality of life in their town. The conclusion is, that by the political action between two countries, should be worked on ecological plant modernization in order to protect the health of th epeople on both sides of river Sava.