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

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Fig. 2 — Measurements of NO₂, including repated measurements, were performed by either occupational hygienists (Expert sampling) or as self-administered sampling (SA sampling). Miners with workers ID no. 1–4 worked with tunnel service and 5–19 worked in the drifts with production preparation, loading and transport