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. Author manuscript; available in PMC: 2017 Jul 1.
Published in final edited form as: Environ Res. 2016 Apr 19;148:310–317. doi: 10.1016/j.envres.2016.04.008

Table 2.

Levels of estimated personal occupational particulate exposure (μg/m3) of terminal-based workers during the sampling period.

All Dock Worker Hostler Clerk
Pollutant Exposure period a n Mean SD n Mean SD n Mean SD n Mean SD
EC
Lag0-12 137 0.13 0.15 68 0.16 0.19 31 0.12 0.08 38 0.09 0.09
Lag12-24 120 0.13 0.14 59 0.15 0.16 26 0.10 0.08 35 0.11 0.14
Lag24-36 97 0.13 0.20 50 0.15 0.27 22 0.10 0.06 25 0.10 0.08
Lag36-48 73 0.13 0.20 38 0.17 0.24 16 0.12 0.16 19 0.06 0.07
OC
Lag0-12 137 2.65 2.31 68 2.61 2.50 31 1.76 1.07 38 3.44 2.47
Lag12-24 120 2.32 2.17 59 2.13 2.21 26 1.52 1.04 35 3.24 2.43
Lag24-36 111 2.24 2.08 57 1.93 2.15 25 1.76 0.96 29 3.25 2.36
Lag36-48 73 2.15 2.19 38 2.02 2.48 16 1.84 1.41 19 2.65 2.10
PM2.5
Lag0-12 137 6.15 6.54 68 7.52 7.51 31 6.17 6.79 38 3.69 2.89
Lag12-24 120 4.68 5.00 59 5.64 5.64 26 4.12 5.49 35 3.46 2.76
Lag24-36 111 4.66 4.88 57 5.31 5.50 25 4.50 5.36 29 3.51 2.49
Lag36-48 73 4.48 5.99 38 6.04 7.38 16 3.07 4.37 19 2.54 2.20
a

Lag0-12: workplace exposure during 0-12 hours before the time of blood draw. Lag12-24: workplace exposure during 12-24 hours before the time of blood draw. Lag24-36: workplace exposure during 24-36 hours before the time of blood draw. Lag36-48: workplace exposure during 36-48 hours before the time of blood draw