Table 4.
Concentration for BTEX compounds in the studies locations. Concentration values expressed in ng m−3 of air and standard deviation inside parenthesis (SD)
| Quiet street | Busy garage | Gas station | Freeway | |
|---|---|---|---|---|
| benzene | 1.7 (0.7) | 16.5 (3.1) | 69.9 (35.0) | 2.1 (0.3) |
| toluene | 6.9 (0.2) | 120.1 (76.7) | 1213.1 (115.0) | 4.6 (0.4) |
| ethylbenzene | 2.6 (0.1) | 60.9 (6.7) | 278.3 (20.0) | 0.7 (0.2) |
| (m+p)-xylene | 5.6 (0.0) | 150.9 (1.7) | 508.6 (2.9) | 1.2 (0.1) |
| o-xylene | 3.1 (0.7) | 54.6 (7.7) | 281.6 (24.8) | 1.2 (0.3) |
| Ratio toluene/benzene (T/B) | 4.0 (1.7) | 7.3 (3.3) | 17.4 (8.1) | 2.2 (0.5) |
| Ratio (m+p-xylene)/ ethylbenzene | 0.4 (0.0) | 0.5 (0.3) | 0.2 (0.1) | 0.2 (0.6) |