. Author manuscript; available in PMC: 2008 Sep 25.

Published in final edited form as: Environ Sci Technol. 2005 Jul 15;39(14):5105–5112. doi: 10.1021/es048226f

Table 1. PM of ambient origin calculated using four methods with increasingly more realistic assumptions.

Infiltration and Contribution		RCS Model	Mass Balance Model	External Mixture Model	Microscopic Mixture Model
Infiltration Factor	Mean	0.35	0.40	0.54	0.69
	Median	0.35	0.38	0.54	0.70
	Standard Deviation	0.0	0.19	0.16	0.23

Contribution (%)	Mean	40	43	59	73
	Median	35	42	58	74
	Standard Deviation	22	26	29	36

Contribution (μg/m³)	Mean	5.9	6.7	8.4	12.0
	Median	5.2	5.8	7.2	10.0
	Standard Deviation	3.6	4.7	5.8	10.1