This project is carried out by DCE - Danish Centre for Environment and Energy, Aarhus University on behalf of Copenhagen Airport, and summarizes and presents the results of an emission inventory compiled for particulate numbers in Copenhagen Airport emitted by aircraft main engines and APU’s (Auxiliary Power Unit), handling equipment and road transport vehicles. The inventory is made with emphasis on the apron in relation to the working environment. The emission inventory was developed in the spring 2013 by DCE - Danish Centre for Environment and Energy, Aarhus University for Copenhagen Airports A/S. The work builds upon the previous assessments conducted by DCE in the period 2009-2011 with the main objectives to quantify the atmospheric pollutants at the apron of Copenhagen Airport based on emission inventories, measurements and model calculations, and in order to quantify the sources to air pollution at the apron.