| Trace Elements |
Ambient Exposure (µg/m3) |
Inhalation Unit Risk (µg/m3) |
ECR (µg/m3) |
| Cd |
0.098 |
1.8 × 10−3 |
1.08 × 10−4 |
| Cr |
0.008 |
1.2 × 10−2 |
7.21 × 10−4 |
| As |
0.016 |
1.6 × 10−3 |
4.4 × 10−6 |
| Be |
0.03 |
4.0 × 10−4 |
4.6 × 10−6 |
| Ni |
0.012 |
2.0 × 10−2 |
2.4 × 10−6 |