Table 2.

The distribution with different size of CB particles in the workplace (particles/cm ³ )

Size	Mean	Maximum	Minimum	SD	Percentage (%)	Accumulative percentage (%)
<0.523 μm	233.77	270.6	208.2	24.32	50.77	50.77
0.523-1 μm	211.33	220.86	206.52	5.49	45.90	96.67
1-2.5 μm	13.24	13.71	12.27	0.58	2.88	99.55
2.5-20 μm	2.08	2.24	1.95	0.13	0.45	100.00