Abstract
Shipping has the major part of world trading with a ratio of approximately 90%. Besides their great benefits on economy, shipping activities are responsible for considerable amounts of harmful emissions and wastes which can be occurred in gaseous, liquid and solid forms. Most of the gaseous emissions are formed during operation phase. In this study, three scenarios are developed based on real shipping data in order to investigate the effect of ship size to air emissions formed during operation phase. In the first scenario, Ship A carries 170,000 tons of goods, per se. In the second scenario, Ship B and Ship C carry 170,000 tons of goods in the same route with Ship A. In the third scenario, Ship B, Ship D and Ship E carry the same amount of load in the same route with the previous scenarios.