Building and Environment will host a series of free webinars on COVID-19 Control. The second webinar of the series will feature 2 presentations from experts in the field on the following topics: COVID-19 and indoor and outdoor sports, presented by Bert Blocken, Professor of Civil Engineering, Eindhoven University of Technology, the Netherlands & KU Leuven, Belgium. Efficient reduction of airborne transmission by advanced ventilation, presented by Arsen K. Melikov, Professor of Ventilation and Air Distribution, Technical University of Denmark, Denmark.