Our work is, for the most part, interdisciplinary and aims at understanding the composition of air and its influence on climate and human health. The majority of our research activities focus on understanding the life cycle and impact of tiny atmospheric particles known as aerosols – both indoors as well as outdoors. Aerosols have implications not only for climate but on human health as well. We also support and encourage active interaction between researchers and policymakers through hosting the Air Quality Reference Laboratory (in collaboration with the Swedish Environmental Protection Agency), organizing events and activities for various stakeholders, as well as participating in expert groups, committees and boards, both at home and internationally. We offer advanced courses at the MSc and PhD levels as well as a joint BSc programme in environmental physics in collaboration with the Department of Physics at Stockholm University.