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The concentrations of BTEX compounds in the indoor air in different countries (μg/m3)
| Studies | Benzene | Toluene | Ethylbenzene | Xylenes | Reference |
|---|---|---|---|---|---|
| Cases | 7 | 2 | ND | 3 | Current study |
| Controls | 1 | 0.3 | ND | 0.3 | Current study |
| Seoul, South Korea | 3 | 40 | 8 | 10 | [62] |
| Ardabil, Iran | 15 | 70 | 12 | 48 | [47] |
| Guangzhou | 18 | 173 | – | 99 | [63] |
| Hong Kong | 5 | 52 | 3 | 8 | [64] |
| Japan | 1 | 12 | 4 | 8 | [65] |
| Mexico city | 7 | 76 | 6 | 26 | [66] |
| Spain | 1 | 4 | 0.6 | 0.7 | [67] |
