Currently over half of world's population lives in urban areas and the fraction is expected to further increase in the future. Thus, increasing number of people is exposed to local urban meteorology and climate at the same time when emitting increasing amount of air pollutants and greenhouse gases to the atmosphere. Our group studies the coupling between the urban ecosystem and the atmosphere using state-of-the-art observations and modelling (more details in Research section). Urban meteorology research group is part of Institute for Atmospheric and Earth System Research (INAR) and Helsinki Institute of Sustainability Science (HELSUS).