Table 1.

Percentage of number and mass input contributed by particles with masses smaller than 1 μg

β	Threshold (dB)	$\frac{\mathit{Number}(m<1\mu g)}{\mathit{Total}}$	$\frac{\mathit{Mass}(m<1\mu g)}{\mathit{Total}}$
Jones (1997)	−10	0.54	0.04
	−20	0.67	0.07
Revision 1	−10	0.27	0.01
	−20	0.38	0.02
Revision 1	−10	0.3	0.02
	−20	0.67	0.07