Table 3 Exposure levels (mg m–3) of TD, RD, and RCS by company.

From: Occupational exposure to respirable crystalline silica in municipal household waste collection and road cleaning workers

Companies

N

TDa

RDb

RCSc

GMd (GSDe)

Range

GM (GSD)

Range

GM (GSD)

Range

A

30

–

0.082 (1.542)

0.052 ~  0.240

0.001 (1.988)

0.001 ~  0.007

B

30

–

0.033 (2.155)

0.004 ~  0.115

0.003 (2.457)

0.001 ~  0.015

C

5

0.042 (2.196)

0.014 ~  0.106

0.016 (1.757)

0.007 ~  0.027

0.002 (2.137)

0.001 ~  0.004

D

2

7.385 (2.337)

4.052, 13.460

0.350 (1.649)

0.246, 0.499

0.019 (1.507)

0.014, 0.024

E

12

0.162 (1.727)

0.058 ~  0.389

0.048 (1.578)

0.022 ~  0.104

0.003 (1.235)

0.002 ~  0.004

F

9

0.588 (1.454)

0.345 ~  0.978

0.065 (1.392)

0.040 ~  0.097

0.007 (1.462)

0.004 ~  0.013

G

2

1.040 (1.122)

1.128, 0.958

0.126 (1.332)

0.103, 0.154

0.003 (1.417)

0.002, 0.004

Total

90

0.278 (4.168)

0.014 ~  13.460

0.053 (2.205)

0.004 ~  0.499

0.0026 (2.383)

0.001 ~  0.024

Background levelf

–

–

0.028 (1.545)

–

0.0007

–

  1. aTotal dust.
  2. bRespirable dust.
  3. cRespirable crystalline silica.
  4. dGeometric mean.
  5. eGeometric standard deviation.
  6. fThe background RCS and RD concentrations are the values obtained by the authors of this study through another research project in 201824.
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