Characterization of Unintentionally Released Nanometric Particles in Various Workplaces STUDIES AND

For the time-averaged measurements, the concentrations of total carbon (TC) measured in this study were lower than the Quebec regulated level of 0.4 mg/m³ stipulated in the Regulation Respecting Occupational Health and Safety in Mines, with the exception of a level of 0.7 mg/m³ recorded in workplace M1. [...] A comparison of the metal concentrations from workplaces M4 and M5 with the recommendations of the American Conference of Governmental Industrial Hygienists (ACGIH) found that all the concentrations were 10% below recommended levels, with the exception of one measurement of manganese (respirable fraction) in the foundry (M4). [...] (2017) identified gaps in the assessment of exposure to URNPs and maintained that, due to the limited representativeness of the measurements and the differences in the way DRIs function, the current data do not allow the creation of job/exposure matrices specific to URNP exposure. [...] The particles were selected by the operator, randomly but with the aim of ensuring good representation of the diversity of particles found on the grid during the initial scan. [...] In each box, the central value represents the median while the lower and upper edges are the 1st and 3rd quartiles respectively and the ends of the moustaches are the maximum and minimum values or 1.5 times the interquartile range (between the 1st and 3rd quartiles).