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. 2021 Oct 27;18(21):11279. doi: 10.3390/ijerph182111279

Figure 2.

Figure 2

Type-S measurement results (during visualization of the NW area). A large number of particles were detected, at around 4000 counts/0.2 s, immediately after the start. However, the number of particles that were measured after 1 min of work significantly decreased, and a steady state was reached after 60 s. The results are similar for the other areas.