fig5
![Questioning the appropriateness of sieving for processing indoor settled dust samples](https://image.oaes.cc/11642af0-7cab-423e-bd8c-db60bafeabb0/4971.fig.5.jpg)
Figure 5. Optical microscopy images of kindergarten dust size fractions (A) <0.25 mm, (B) 0.25-0.5 mm, (C) 0.5-1 mm, and (D) 1-2 mm.
Figure 5. Optical microscopy images of kindergarten dust size fractions (A) <0.25 mm, (B) 0.25-0.5 mm, (C) 0.5-1 mm, and (D) 1-2 mm.
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