Prof. Dan Norbäck, Ph.D., Professor in Environmental Medicine, Department of Occupational and Environmental Medicine, University Hospital, Uppsala, Sweden had visited RIHES between 3-7 January 2017 to cooperate in Haze Free Thailand (HFT_RIHES), a 3-year project (2016-2019) funded by the National Research Council of Thailand (NRCT) and Chiang Mai University, in which Dr. Tippawan Prapamontol, Ph.D., senior researcher of the Environment and Health Research Unit of RIHES is the principal investigator. At this visit, Prof. Dan Norbäck was given a warm welcome by Prof. Suwat Chariyalertsak, M.D., Director, and Prof. Kittipan Rerkasem, M.D., Head of the Center for Applied Health Science Research, along with the researchers of the Environment and Health Research Unit.