Table 3.

Results with model uncertainty for OC (μgm⁻³ OC) and EC apportionment (μgm⁻³ EC).

OC apportionment	Cigarette smoke	Unc	Diesel	Unc	Spark ignition	Unc	Lubricating oil-impacted exhaust	Unc	Unapportioned	Total OC	Unc
Dockworker	0.60	0.06	0.37	0.07	0.45	0.13	3.67	0.32	7.91	13.00	1.02
Mechanic	2.06	0.21	0.71	0.11	0.30	0.09	5.88	0.48	10.85	19.78	1.45
Hostler	0.90	0.10	0.37	0.11	0.97	0.81	4.33	0.89	6.72	13.35	1.12
Long-haul driver	2.77	0.30	0.47	0.09	0.38	0.12	10.19	0.82	10.19	24.05	1.66
P and D driver	1.06	0.11	0.98	0.13	0.60	0.17	4.61	0.42	10.75	17.98	1.30
Dock	0.53	0.06	0.43	0.07	0.16	0.06	3.45	0.29	6.42	11.03	0.90
Shop	0.27	0.03	0.73	0.10	0.44	0.15	3.74	0.34	7.63	12.76	0.95
Yard	0.00	0.00	0.45	0.07	0.00	0.04	2.36	0.22	5.79	8.62	0.76
Urban background	0.00	0.00	0.34	0.06	0.22	0.06	0.76	0.10	7.08	8.43	0.74
EC apportionment	Cigarette smoke	Unc	Diesel	Unc	Spark ignition	Unc	Lubricating oil-impacted exhaust	Unc	Unapportioned	EC	ECU
Dockworker	0.00	0.00	0.95	0.18	0.13	0.04	0.07	0.01	−0.04	1.12	0.16
Mechanic	0.02	0.00	1.82	0.28	0.09	0.03	0.11	0.01	0.01	2.04	0.23
Hostler	0.01	0.00	0.95	0.29	0.28	0.23	0.08	0.02	−0.02	1.30	0.19
Long haul	0.02	0.00	1.21	0.24	0.11	0.03	0.20	0.02	0.02	1.55	0.20
P and D	0.01	0.00	2.51	0.34	0.17	0.05	0.09	0.01	−0.08	2.71	0.25
Dock	0.00	0.00	1.11	0.18	0.05	0.02	0.07	0.01	−0.04	1.18	0.15
Shop	0.00	0.00	1.86	0.25	0.13	0.04	0.07	0.01	−0.09	1.97	0.18
Yard	0.00	0.00	1.15	0.18	0.00	0.01	0.05	0.01	0.00	1.19	0.15
Urban background	0.00	0.00	0.86	0.16	0.06	0.02	0.02	0.01	0.00	0.94	0.14

OC, organic carbon; EC, elemental carbon; P and D, pickup and delivery; Unc, uncertainty calculated in the model based on model fit.