Table 3.

Cut-off aerodynamic diameter for stages of Andersen cascade impactor (ACI) at a flow rate of 28.3 L/min.

ACI Stages	Cut-Off Diameter at 28.3 L/min (µm)
0	9.0–10.0
1	5.8–9.0
2	4.7–5.8
3	3.3–4.7
4	2.1–3.3
5	1.1–2.1
6	0.7–1.1
7	0.4–0.7
Filter	<0.4