Table 5.

Summary of respirable non-fibrous SiC levels by plant and job group, exposure intensity in samples collected with 6–8 h sampling time

Job group	Respirable non-fibrous SiC (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	0.014	0.009	2.6	0.010	0.72								9	4	0.066	0.036	3.0	0.034	0.22
Charger															9	5	0.075	0.067	1.7	0.068	0.16
Charger/mix															10	5	0.18	0.14	2.1	0.13	0.53
Payloader	7	2	0.17	0.047	6.9	0.033	0.071	5	1	0.046	0.044	1.4	0.044	0.052	17	9	0.046	0.032	2.4	0.032	0.17
Crane	23	7	0.014	0.008	2.6	0.008	0.097	17	5	0.019	0.015	2.2	0.015	0.052	13	5	0.016	0.004	3.2	0.004	0.16
Control room	19	6	0.044	0.038	1.8	0.035	0.097	19	5	0.034	0.022	2.5	0.022	0.16	19	7	0.011	0.008	2.1	0.008	0.029
Cleaning	2	1	0.54	0.49	1.9	0.49	0.77
Sorting	20	5	0.10	0.086	1.7	0.083	0.26	18	4	0.48	0.24	3.1	0.22	3.6	18	9	0.35	0.31	1.7	0.31	0.68
Processing
Refinery
Crusher	29	11	0.89	0.65	2.4	0.65	2.1	13	3	0.54	0.36	2.5	0.39	2.1	19	6	0.69	0.45	2.4	0.46	3.8
Other	27	11	0.11	0.087	2.0	0.087	0.30	26	14	0.26	0.11	3.6	0.11	1.2	31	8	0.38	0.22	2.8	0.27	1.4
Fines	20	14	0.12	0.083	2.3	0.081	0.41	56	22	0.29	0.16	3.1	0.18	0.98	48	15	0.29	0.22	2.0	0.22	0.84
Maintenance
Mechanics	47	17	0.098	0.054	3.0	0.053	0.40	48	18	0.14	0.076	3.1	0.079	0.52	28	9	0.075	0.039	2.8	0.042	0.28
Electrician	20	7	0.068	0.052	2.2	0.052	0.17	20	7	0.12	0.068	2.5	0.067	0.55	10	5	0.086	0.038	3.9	0.038	0.33

There is no Norwegian OEL for respirable SiC; however, American Conference of Industrial Hygienists have suggested a threshold limit value of 3 mg m⁻³ (ACGIH, 2007).

^aAdjusted with mixed effect models.

^bNumber of measurements.

^cNumber of persons.

^dGeometric standard deviation.

^e95th percentile.