As | Cd | Cr | Cu | Fe | Hg | Ni | Pb | Sb | Ti | V | Zn | MMI | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1990–1995 | Aa | Ac | Ab | Ab | Aa | – | Ab | Aa | – | Aa | Aa | Ab | Aa |
1990–2000 | Aa | Aa | Aa | Aa | Aa | – | Aa | Aa | – | Aa | Aa | Aa | Aa |
1990–2005 | Aa | Aa | Ac | Aa | Aa | – | Aa | Aa | – | Aa | Aa | Aa | Aa |
1995–2000 | Ab | Aa | Aa | Aa | Z | Z | Ab | Aa | Ac | Aa | Aa | Aa | Aa |
1995–2005 | Aa | Aa | Z | Aa | Aa | Aa | Aa | Aa | Ac | Aa | Aa | Aa | Aa |
2000–2005 | Aa | Aa | Z | Aa | Aa | Aa | Aa | Aa | Z | Aa | Aa | Aa | Ac |