The Baltic Sea is one of the busiest seas in the world and both the number of ships and the quantities of cargo afloat on the Baltic are growing rapidly. In the first seven months of the year 2011, the Port of Tallinn handled the largest volume of cargo out of the Baltic’s largest ports, which was followed by the Port of Klaipeda in Lithuania and the Port of Riga, according to statistics gathered by port authorities [6]. Due to fast growing intensive researches how to reduce air pollution and emission from ships are made. The most important it is in large ports located in cities. There are different technical solutions how to reduce NOx, SOx, CO2, PM, VOC, but the most effective method in ports is OPS (Onshore Power Supply) at once very expensive method. In the Baltic as one of more intensive shipping region in the world it is very important to solve air pollution problem. Today 3 Baltic States ports are in different positions, but far from „green port” status. OPS installation follow-up needs big investments and close cooperation between port authorities and ship owners at first, so the most important role plays cost factor and closed cooperation in terms of standardization.