Particulate Reference Table
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ISO
FS209
Number of Particles per Cubic Meter
Class
Class
0.1 µm
0.2 µm
0.3 µm
0.5 µm
1.0 µm
5.0 µm
1
---
10
2
---
---
---
---
2
---
100
24
10
4
---
---
3
1
1,000
237
102
35
8
---
4
10
10,000
2,370
1,020
352
83
---
5
100
100,000
23,700
10,200
3,520
832
29
6
1,000
1,000,000
237,000
102,000
35,200
8,320
293
7
10,000
---
---
---
352,000
83,200
2,930
8
100,000
---
---
---
3,520,000
832,000
29,300
9
---
---
---
---
35,200,000
8,320,000
293,000
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