Fig. 1From: Road tunnel-derived coarse, fine and ultrafine particulate matter: physical and chemical characterization and pro-inflammatory responses in human bronchial epithelial cellsHydrodynamic size distribution based on the relative mass of coarse, fine and ultrafine PM sampled in the Marienborg and Hell tunnels. A Marienborg PM, dry road surface conditions; B Marienborg PM, humid road surface conditions; C Hell PM, dry road surface conditions; D Hell PM, humid road surface conditions. The hydrodynamic size distributions were determined by the Disc centrifugation method, as described in “Materials and methods”, from representative analysesBack to article page