Fig. 6. Concentrations of 71 PAH in the particulate fraction of open loop (top and zoom in middle) and closed loop (bottom) scrubber discharge water samples of the four ships. 1,8-Dimethylnaphthalene, retene, 4-methylchrysene, 3-methylcholanthrene, 6-methylbenzo[a]pyrene, indeno[1,2,3,-cd]pyrene, naphtha[2,3-b]fluo- ranthene, naphtho[2,3-a]pyrene, dibenzo[a,i]pyrene and dibenzo[a,h]pyrene were below the detection limit. C. Achten et al. Marine Pollution Bulletin 208 (2024) 116790 9