Table 5.

PM2.5 Summary Statistics by Location and Job

		Arithmetic		Geometric
	N	Mean	SD	Mean	SD
Work Area
Office	111	8.45	12.36	6.01	2.42
Yard Upwind (background)	612	12.71	9.27	9.75	2.34
Dock	692	16.84	17.96	14.42	1.88
Shop	211	27.60	27.47	19.32	2.36
Non-smokers
On-site Workers
Clerk	12	7.19	5.23	5.96	1.86
Dockworker	307	21.84	13.86	18.73	1.75
Mechanic	97	40.82	37.26	31.07	2.04
Hostler	68	27.09	19.30	22.02	1.91
Off-site Drivers
P&D	348	19.14	11.49	16.20	1.82
LH	160	25.39	19.07	19.26	2.30
Smokers
On-site Workers
Clerk	1	71.52	-	-	-
Dockworker	97	43.89	34.81	34.60	1.98
Mechanic	29	51.36	36.32	41.65	1.93
Hostler	21	95.48	117.90	59.51	2.59
Off-site Drivers
P&D	105	55.83	78.01	36.52	2.36
LH	76	140.59	682.27	32.81	3.23

Values in μg/m³