Table 8.

Summary of total dust short-term levels by plant and job group, exposure intensity in samples collected with 0.5–3.5 h sampling time

Job group	Total dust short-term (mg m−3)
	Plant A							Plant B							Plant C
	Unadjusted					Adjusteda		Unadjusted					Adjusteda		Unadjusted					Adjusteda
	Nb	Kc	AM	GM	GSDd	GM	P95e	Nb	Kc	AM	GM	GSDd	GM	P95e	Nb	Kc	AM	GM	GSDd	GM	P95e
Furnace
Mix	13	3	2.3	1.4	2.9	1.5	8.6								10	5	3.0	1.3	3.0	1.3	20
Charger															10	4	7.3	6.9	1.4	6.9	11
Charger/mix															11	5	6.2	5.1	1.7	5.3	23
Payloader	10	2	2.2	1.1	3.6	1.1	7.9	5	1	6.7	2.3	6.3	2.3	22	18	6	2.3	1.2	3.3	1.2	8.5
Crane	20	8	0.57	0.42	1.9	0.42	2.2	19	7	0.84	0.52	3.0	0.61	2.9	14	7	0.52	0.38	2.4	0.37	1.5
Control room	21	5	1.9	1.3	2.5	1.3	4.2	19	5	1.5	1.2	1.9	1.2	4.6	18	8	1.2	0.81	2.7	0.85	4.7
Cleaning	1	1	3.9	3.9		3.9	3.9
Sorting	19	5	1.5	1.0	2.3	0.99	7.1	20	4	4.3	2.7	2.6	2.5	13	21	9	7.5	5.4	2.1	5.2	23
Processing
Refinery
Crusher	25	14	5.3	3.8	2.4	3.6	13	15	2	5.0	3.7	2.4	3.6	13	19	6	2.3	1.7	2.2	1.6	9.1
Other	28	12	1.3	0.98	2.3	0.87	3.4	27	13	1.3	0.94	2.3	0.95	4.1	32	8	2.4	1.8	2.3	1.9	8.0
Fines	31	21	5.8	2.4	4.2	2.5	24	60	23	2.7	1.3	3.5	1.5	9.0	49	19	3.1	1.8	2.8	1.8	11
Maintenance
Mechanics	47	18	1.2	0.75	2.8	0.76	3.8	47	16	2.0	1.1	3.2	1.0	7.5	27	9	1.9	1.4	2.3	1.4	4.6
Electrician	21	7	0.85	0.65	2.0	0.63	2.7	22	7	1.1	0.41	4.4	0.43	2.4	10	5	0.74	0.34	3.2	0.36	4.1

^aAdjusted with mixed effect models.

^bNumber of measurements.

^cNumber of persons.

^dGeometric standard deviation.

^e95th percentile.