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. 2022 Mar 16;95(6):1369–1388. doi: 10.1007/s00420-022-01843-x

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Fig. 4 — The measurements in the personal breathing zones (PBZ) compared to the measurements in the underground ambient zones (UAZ) for three locations in the mine. For the PBZ measurements the geometric means of the workers in each location are used. In Tunnels n = 3, in Drift 1 n = 3, in Drift 2 n = 4. PAHs are the sum of the 16 US EPA PAHs