Abstract
Efficient and environmentally friendly public transport is a requirement of a modern city. For many years, Krakow has been building a modern multimodal transportation system, with the bus services playing a significant role. The article presents the results of the studies carried out on the fleet of urban buses operating within the Krakow agglomeration in the years 2010-2015. The influence of modernization of the urban bus fleet in the specified period on emissions of the most significant air pollutants into the air was evaluated. The studies have confirmed a total reduction in emissions from buses during the study period at levels of approximately 28 % for NOx, approximately 35 % for PM10, approximately 39 % for PM2.5 and approximately 43 % for NMVOC.