1. Institute of Chemistry, ELTE – Eötvös Loránd University, Budapest, Hungary
2. Tartu College, School of Engineering, Tallinn University of Technology, Tartu College, Tartu, Estonia
3. Faculty of Environmental Sciences, Czech University of Life Sciences, Prague – Suchdol, Czech Republic
4. Fundación CEAM, Paterna (Valencia), Spain
5. Department of Environmental Science – Atmospheric Measurements, University of Aarhus, Roskilde, Denmark
6. Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio, Finland
7. Environmental Health Unit, Finnish Institute for Health and Welfare, Kuopio, Finland