Table 2. Level of inhaled elemental components during work hours on the examination days.

	Office Workers								Truck Drivers
	Obs	Mean	SD	10pct	25pct	Median	75pct	90pct	Obs	Mean	SD	10pct	25pct	Median	75pct	90pct
Inhaled elemental componentsa (μg/m3) on the examination days, from personal monitors
Al	118	0.54	0.25	0.23	0.37	0.50	0.70	0.86	120	1.36	0.93	0.44	0.59	1.29	1.86	2.32
Ca	118	0.32	0.18	0.15	0.19	0.28	0.41	0.54	120	2.09	2.20	0.29	0.40	1.58	3.08	4.52
Fe	118	0.38	0.21	0.17	0.24	0.34	0.44	0.69	120	1.01	0.64	0.38	0.50	0.82	1.34	1.75
K	118	0.76	0.77	0.18	0.27	0.56	0.82	2.07	120	1.31	1.07	0.34	0.44	0.89	2.06	2.81
S	118	6.19	5.05	0.61	1.66	5.30	8.64	13.77	120	8.43	4.92	2.30	4.87	6.98	12.47	16.14
Si	118	0.79	0.53	0.28	0.45	0.68	1.03	1.43	120	2.37	1.76	0.64	0.82	2.09	3.54	4.13
Ti	118	0.02	0.01	0.00	0.01	0.02	0.03	0.04	120	0.06	0.04	0.02	0.03	0.05	0.08	0.10
Zn	118	0.15	0.17	0.02	0.05	0.08	0.22	0.37	120	0.27	0.22	0.06	0.09	0.17	0.41	0.68

^aMeasured during the work hours of examination days using light-weight personal monitors.