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. 2020 Jun 16;31(4):736–752. doi: 10.1038/s41370-020-0241-3

Fig. 3. Coarse particle number concentration (APS, left y-axis) and black carbon concentration (portable aethalometer, µ-Aeth & aethalometer, Aeth, right y-axis) measured in the emission zone (EZ) and the background zone (BZ). The figure shows the measurements during weighing of the graphene oxide powder during Study B (work task B1).

Fig. 3

Note the different scales on the y-axes.