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Table 3 Environmental tea dust measurements of four tea manufacturing factories

From: Pulmonary function, respiratory symptoms, and dust exposures among workers engaged in early manufacturing processes of tea: a cohort study

Factory Inhalable Dusts (mg/m3) Respirable Dusts (mg/m3) Coarse Fraction (mg/m3)
  Withering Panning Ball-Rolling Withering Panning Ball-Rolling Withering Panning Ball-Rolling
A 0.81 1.25 2.51 0.19 0.74 0.29 0.62 0.51 2.22
B 0.93 3.24 2.32 ND* 0.74 0.27 0.93 2.5 2.05
C 1.19 1.79 5.61 0.41 0.60 0.55 0.78 1.19 5.06
D 1.13 1.83 2.64 0.27 1.04 0.25 0.86 0.79 2.39
Mean ± SD 1.01 ± 0.18 2.03 ± 0.85 3.27 ± 1.57 0.21 ± 0.17 0.78 ± 0.19 0.34 ± 0.14 0.80 ± 0.13 1.25 ± 0.88 2.93 ± 1.43
  1. *ND non-detectable