Table 2.
Descriptive statistics of air toxics
| Air toxic | Mean (SD) a | IQR |
|---|---|---|
| Ortho-xylene (ppbV) | 0.50 (0.33) | 0.39 |
| Toluene (ppbV) | 2.89 (1.77) | 2.20 |
| Ethyl Benzene (ppbV) | 0.38 (0.19) | 0.18 |
| 1,3-Butadiene (ppbV) | 0.30 (0.18) | 0.26 |
| Benzene (ppbV) | 1.30 (0.86) | 1.22 |
| Styrene (ppbV) | 0.16 (0.12) | 0.14 |
| Perchloroethylene (ppbV) | 0.20 (0.20) | 0.23 |
| Lead (ng/m3) | 22.99 (18.63) | 19.93 |
| Meta/para-xylene (ppbV) | 1.05 (0.59) | 0.67 |
| Total PAHs (ng/m3) | 1.44 (1.06) | 1.05 |
| Benzo(b)fluoranthene (ng/m3) | 0.25 (0.22) | 0.19 |
| Benzo(k)fluoranthene (ng/m3) | 0.10 (0.09) | 0.08 |
| Indeno(1,2,3-cd)pyrene (ng/m3) | 0.31 (0.24) | 0.23 |
| Benzo(a)pyrene (ng/m3) | 0.20 (0.21) | 0.16 |
| Dibenz(a,h)anthracene (ng/m3) | 0.03 (0.03) | 0.01 |
| Benzo(g,h,i)perylene (ng/m3) | 0.56 (0.35) | 0.45 |
| Carbon Tetrachloride (ppbV) | 0.10 (0.02) | 0.03 |
| Trichloroethylene (ppbV) | 0.08 (0.12) | 0.05 |
| Ortho-Dichlorobenzene (ppbV) | 0.11 (0.04) | 0.08 |
| Chloroform (ppbV) | 0.04 (0.01) | 0.02 |
| Para-Dichlorobenzene (ppbV) | 0.15 (0.04) | 0.04 |
| Formaldehyde (ppbV) | 2.87 (1.20) | 1.33 |
| Selenium (ng/m3) | 1.56 (0.70) | 0.73 |
| Chromium (total; ng/m3) | 5.31 (2.75) | 3.22 |
| Hexavalent chromium (ng/m3) | 0.19 (0.11) | 0.13 |
| Acetaldehyde (ppbV) | 1.42 (0.69) | 0.90 |
| Nickel (ng/m3) | 5.08 (2.27) | 3.18 |
a
Mean values shown are among controls only.