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The average concentration of toluene and m,p-xylene in selected fuel stations around the world.
| Studied by | Location | Toluene | M, p-xylene |
|---|---|---|---|
| This study | Mashhad (site 1) | 139.29 | 192.56 |
| Mashhad (site 2) | 254.63 | 637.84 | |
| Mashhad (site 3) | 85.23 | 238.61 | |
| Sehgal et al.38 | Delhi | 5890 | 9512 |
| Esmaeel nejad et al.39 | Shahreza | 402.5 | 439 |
| Rattanajongjitrakorn et al.31 | Bangkok | 1984 | 496 |
| Correa et al.29 | Rio de Janeiro | 47.7 | 46.9 |
