Belgian Earth Observation Day, 5 september, Brugge Chlorophyll fluorescence of urban vegetation in relation to traffic exposure: a novel biomonitoring approach Shari Van Wittenberghe 1 , Luis Alonso 2 , Inge Hermans 3 , Jochem Verrelst 2 , Jesus Delegido 2 , Frank Veroustraete 1 , Roland Valcke 3 , José Moreno 2 , Roeland Samson 1