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. Author manuscript; available in PMC: 2015 Aug 28.
Published in final edited form as: J Occup Environ Hyg. 2013;10(1):D6–10. doi: 10.1080/15459624.2012.739439

TABLE II.

GM (sample size) and Range of 8-Hour Respirable Dust and Silica Concentrations

Company A
Company B
Company C
Company D
GM (n) Range (mg/m3) GM (n) Range (mg/m3) GM (n) Range (mg/m3) GM (n) Range (mg/m3)
Respirable dustA 0.83 (16) 0.2–2.2 0.86 (8) 0.2–1.8 1.19 (7) 0.7–3.6 0.89 (7) 0.3–2.9
Respirable silica 0.12 (16) 0.04–0.32 0.14 (8) 0.04–0.25 0.16 (7) 0.07–0.44 0.14 (7) 0.04–0.44

Note: The minimum quantifiable concentration (MQC) for respirable silica was 0.04 mg/m3. Two of the 7 results for Company C were based on partial shifts and not a typical 8-hr TWA.

A

Range of general industry OSHA PELs for 8-hr respirable dust containing silica for Companies A, B, C, and D are 0.51–0.87, 0.42–0.67, 0.53–0.85, and 0.49–0.74 mg/m3, respectively.