Fig. 5.

eBC concentrations in drift 1 measured in the underground ambient zone and PBZ of the miners. In a the two underground loaders in the drift operated on petroleum diesel. In b the single underground loader operated on HVO30 (only one loader this day). Only PBZ for miner operating the Stage IIIB loader (worker ID no. 5) is included in (b) as the miner operating the Stage IV loader (worker ID no. 6) did not work in the drift during the HVO30 test due to vehicle malfunction. The miners were moving the ore from the drift to the shafts, which were located within the drift. The concentration in the ambient zone in the same drift is given with 1 s resolution (shaded areas) and 1 min moving average. The PBZ exposure is measured with 30 s resolution