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Mass concentration of the metals found in the elemental analysis using ICP-MS of each digested nano-MOUDI filters during days 1, 2 and 3 at the machining center (a) and foundry (b) sites. Fe concentrations are really high for a few nano-MOUDI stages; therefore a grid line was added to mark a change in the scale dimensions at 50 μg/m3 and 20 μg/m3 for the (a) and (b), respectively.
