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. Author manuscript; available in PMC: 2020 Mar 23.
Published in final edited form as: J Occup Environ Hyg. 2019 Mar 14;16(6):387–399. doi: 10.1080/15459624.2018.1559925

Figure 3.

Figure 3.

SEM images of particles found at the machining center and foundry sites for different size ranges including for particles collected by the nano-MOUDI stages 3 (3.2–5.6μm), 5 (1–1.8μm), 7 (320–560nm) and 9 (100–180nm) at the machining center (a) and foundry (b).