Explosive eruptions at White Island could occur at any time with little or no warning, GNS Science says.
Duty Volcanologist Michael Rosenberg said although volcanic tremors remain weak today, White Island is an active volcano and always presents some level of risk.
He said tourists to White Island are at a "high level of risk", and caution should be taken if visiting the island, particularly when approaching the active crater.
Rosenberg said hazards to visitors include the health effects of volcanic ash and acid gas exposure, including respiratory issues, skin and eye sensitivity to acid gases.
Rosenberg said a low altitude plume of steam and gas with intermittent minor ash is still being emitted.
The Aviation Colour Code was this afternoon downgraded from an orange to a yellow.