Zilaout H, Houba R, Kromhout H. Temporal trends in respirable dust and respirable quartz concentrations within the European industrial minerals sector over a 15-year period (2002–2016). Occupational and Environmental Medicine 2020; 77:268-275.

In the published version the unit got inadvertently deleted in this sentence:

“Geometric mean respirable quartz concentrations per job per site per campaign varied even more at four orders of magnitude from 0.1 to 1 mg/m³ (figure 2B).”

Correct sentence should be:

“Geometric mean respirable quartz concentrations per job per site per campaign varied even more at four orders of magnitude from 0.1 µg/m³ to 1 mg/m³ (figure 2B).”. The latter is the correct variable that is used in data analysis of this paper.