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. 2015 Apr 7;59(6):705–723. doi: 10.1093/annhyg/mev020

Table 4.

EC and TEM exposures by industry.

Industry Sample EC TEM
n GM (μg m−3) GSD Min. Max. 8-h TWA GM (μg m−3) 8-h TWA GSD n GM (s cm−3) GSD Min. Max. 8-h TWA GM (s cm−3) 8-h TWA GSD
Primary manufacturer (n = 4) PBZ Resp. 7 0.05 2.29 0.02 0.19 0.04 2.29
PBZ Inhal. 11 0.19 7.78 0.01 1.95 0.11 5.11 11 0.011 2.77 0.003 0.090 0.007 2.34
AS Resp. 11 0.26 2.77 0.06 1.68 0.16 2.36
AS Inhal. 13 0.06 8.85 0.01 4.29 0.03 5.46 13 0.005 4.61 0.0001 0.034 0.003 4.49
Hybrid producer/ user (n = 2) PBZ Resp. 9 0.68 2.38 0.15 2.40 0.41 3.05
PBZ Inhal. 9 13.39 3.45 1.59 79.57 7.93 2.34 9 0.042 2.88 0.010 0.169 0.026 2.49
AS Resp. 12 0.22 3.46 0.05 3.02 0.15 3.32
AS Inhal. 12 2.81 5.18 0.17 210.22 1.96 3.66 12 0.008 8.66 0.0001 0.631 0.005 8.06
Secondary manufacturer— electronics (n = 4) PBZ Resp. 5 0.93 1.73 0.50 1.94 0.18 1.52
PBZ Inhal. 18 0.52 4.56 0.05 5.21 0.12 6.91 18 0.001 6.30 0.0001 0.214 0.0002 5.65
AS Resp. 14 0.27 7.49 0.02 6.94 0.04 5.43
AS Inhal. 14 0.19 3.27 0.04 1.45 0.03 4.20 14 0.001 3.29 0.0001 0.015 0.0001 2.12
Secondary manufacturer— composites/ thermoplastics (n = 4) PBZ Resp. 4 0.70 2.76 0.34 2.94 0.19 2.04
PBZ Inhal. 9 5.47 2.01 1.79 21.23 0.86 3.72 13 0.041 12.26 0.0005 1.613 0.008 13.47
AS Resp. 12 0.60 4.33 0.05 3.89 0.13 3.52
AS Inhal. 14 0.33 2.46 0.09 1.65 0.07 2.19 13 0.010 7.47 0.0003 0.295 0.002 6.13

All EC values have been background corrected. AS, area sample; Resp., respirable size fraction; Inhal., inhalable size fraction; s cm−3, CNT or CNF structures per cubic centimeter.