. 2020 Oct 9;7:1373–1380. doi: 10.1016/j.toxrep.2020.10.003

Table 2.

Recommended values of the parameters used to calculate the daily exposure dose of trace elements in dusts.

Parameters	Unit	Values
Heavy metal concentration (C)^a	mg kg⁻¹
Skin-surface area (SA)^a	cm²	5800
Exposure frequency (EF)^a	day year⁻¹	350
Exposure duration (ED)^a	year	30
Conversion factor (CF)^a	L cm⁻³	0.07
Body weight (BW)^b	kg	70
ABS^a		0.1
Average time (AT) ^a	Days	For non-carcinogenic risk: ED×365
		For carcinogenic risk: 70 × 365
Particle emission factor (PEF)^a	kg m⁻³	1.36 × 10⁹
Ingestion rate ingR^a	mg day⁻¹	100
Inhalation rate inhR^a	day m⁻³	20

References: a = DoEA [43]; b = USEPA [47].