Comparison of OELs for six solvents in different European Union member states (ppm, 8 h TWAs)
| Substance | UK: OES | Germany: MAK | Sweden | Netherlands |
| Xylene | 100 | 100 | 50 | 50 |
| Trimethyl benzenes | 25 | 25 | 20 | |
| n-Hexane | 20 | 50 | 25 | 25 |
| Ethyl ether | 400 | 400 | 400 | 100 |
| Toluene | 50 | 50 | 50 | 40 |
| Perchloroethylene | 50 | 10 | 35 |
MAK=Maximale Arbeitsplatz Konzentration.