Sevoflurane Isoflurane Enflurane Desflurane Halothane N2O
Austria - - - - 5 -
Denmark - - 2 - 5 100
France - - - - 2 -
Germany - - 20 - 5 100
England - 50 50 - 10 100
Italy - - - - - 100
Norway - 2 2 - 5 100
Sweden - 10 10 - 5 100
Switzerland - 10 10 - 5 100
United States 2 2 2 2 2 25
Table 2: The highest allowed anesthetic gas concentrations in operating rooms.