The Aviation Colour Code (ACC) system is based on four colours and is only intended for use by the civil aviation community. The Aviation Colour Codes provide the aviation community with information about volcanic activity and the potential presence of volcanic ash in the atmosphere.
Table showing the current volcanic aviation colour codes.
| Volcano | ICAO Colour Code |
|---|---|
| Whakaari/White Island | Yellow |
| Ruapehu | Green |
| Auckland Volcanic Field | Green |
| Kermadec Islands | Green |
| Mayor Island | Green |
| Ngauruhoe | Green |
| Northland | Green |
| Okataina | Green |
| Rotorua | Green |
| Taranaki | Green |
| Taupo | Green |
| Tongariro | Green |