TABLE 2.
Concentrations (Arithmetic Mean ± Standard Deviation, at Sites with More than One Sample) of PM1.0 (Elemental and Organic Carbon) and TPAH at Each of the Diesel Vehicle Sites
| location | [EC] (μg m−3) | [OC] (μg m−3) | [TPAH] (ng m−3) |
|---|---|---|---|
| distribution center dock | 4 ± 1 | 22 ± 4 | 212 ± 33 |
| distribution center background | 4 ± 1 | 13 ± 2 | 312 ± 66a |
| distribution center delivery truck trips | 16 ± 3 | 35 ± 8 | 596 ± 204 |
| cargo terminal dock | 5 ± 2 | 25 ± 5 | 32 ± 12a |
| cargo terminal background | 3 | 17 | 29 |
| bus terminal exit | 22 | 22 | 834 |
| bus terminal background | 3 | 15 | 22 |
a
The sampling period of the PAS measurements is significantly shorter than for the filter samples.