This study includes an assessment of air pollution at the apron of Copenhagen Airport in relation to the working environment. The Assessment has been carried out during the period 2009 to 2011 by DCE - Danish Centre for Environment and Energy, Aarhus University (DCE) for Copenhagen Airports A/S. The aim of the assessment was to investigate the air pollution at the apron and to identify sources of air pollution. The study focuses on the working environment. Therefore, the emphasis is on air pollution at the apron, with focus on the areas where the staff is mainly present during the working hours. The assessment includes air pollutants, which are suspected to cause problems regarding the working environment at the apron. These are the following: Nitrogen oxides (NO and NO2), sulfur dioxide (SO2), the mass of particles with diameter below 2.5 μm (PM2. 5), particle numbers and their size distribution, particulate elemental carbon (soot), polycyclic aromatic hydrocarbons (PAH) and selected volatile organic compounds (VOC).