| Benzene | Toluene | Ethylbenzene | Xylenes | |||||||||
| Gas stations | CDIL | HQ | CR | CDIL | HQ | CR | CDIL | HQ | CR | CDIL | HQ | CR |
| (mg·kg−1·dia−1) | (mg·kg−1·dia−1) | (mg·kg−1·dia−1) | (mg·kg−1·dia−1) | |||||||||
| S1 | 1.07 × 10−2 | 3.13 | 3.09 × 10−4 | 1.03 × 10−2 | 1.84 × 10−2 | - | 9.00 × 10−4 | 7.89 × 10−3 | - | 4.25 × 10−3 | 3.68 × 10−1 | - |
| S2 | 1.40 × 10−3 | 4.10 × 10−1 | 4.05 × 10−5 | 7.65 × 10−4 | 1.37 × 10−3 | - | 2.84 × 10−4 | 2.49 × 10−3 | - | 5.73 × 10−4 | 4.96 × 10−2 | - |
| S3 | 3.24 × 10−3 | 9.50 × 10−1 | 9.40 × 10−5 | 1.82 × 10−3 | 3.25 × 10−3 | - | 2.13 × 10−4 | 1.86 × 10−3 | - | 1.29 × 10−3 | 1.12 × 10−1 | - |
| S4 | 2.23 × 10−3 | 6.55 × 10−1 | 6.47 × 10−5 | 1.80 × 10−3 | 3.21 × 10−3 | - | 5.11 × 10−4 | 4.48 × 10−3 | - | 8.74 × 10−4 | 7.55 × 10−2 | - |
| S5 | 4.34 × 10−3 | 1.27 | 1.26 × 10−4 | 1.55 × 10−3 | 2.77 × 10−3 | - | 5.03 × 10−4 | 4.41 × 10−3 | - | 1.17 × 10−3 | 1.01 × 10−1 | - |
| S6 | 1.30 × 10−2 | 3.82 | 3,78 × 10−4 | 3.44 × 10−3 | 6.16 × 10−3 | - | 5.06 × 10−4 | 4.43 × 10−3 | - | 2.32 × 10−3 | 2.01 × 10−1 | - |
| S7 | 7.31 × 10−2 | 2.14 | 2.12 × 10−4 | 3.10 × 10−3 | 5.56 × 10−3 | - | 5.64 × 10−4 | 4.95 × 10−3 | - | 1.02 × 10−3 | 8.83 × 10−2 | - |
| S8 | 1.15 × 10−2 | 3.38 | 3.35 × 10−4 | 4.21 × 10−3 | 7.55 × 10−3 | - | 7.11 × 10−4 | 6.23 × 10−3 | - | 1.80 × 10−3 | 1.55 × 10−1 | - |
| S9 | 4.90 × 10−3 | 1.44 | 1.42 × 10−4 | 3.02 × 10−3 | 5.40 × 10−3 | - | 6.26 × 10−4 | 5.48 × 10−3 | − | 1.51 × 10−3 | 1.31 × 10−1 | - |
| S10 | 4.22 × 10−3 | 1.24 | 1.22 × 10−4 | 2.23 × 10−3 | 4.00 × 10−3 | - | 4.17 × 10−4 | 3.65 × 10−3 | - | 1.06 × 10−3 | 9.13 × 10−2 | - |
| Average | 1.84 | 1.82 × 10−4 | 5.76 × 10−3 | 4.59 × 10−3 | 1.37 × 10−1 | |||||||
| SD | 1.21 | 1.19 × 10−4 | 4.79 × 10−3 | 1.74 × 10−3 | 9.15 × 10−2 | |||||||