Aviation Colour Codes are based on four colours and are intended for quick reference only in the international civil aviation community; they are part of the ICAO International Airways Volcano Watch system (IAVW). The Aviation Colour Code reflects conditions at or near a volcano and are not intended to pertain to hazards posed at a distance or downwind by drifting ash. The codes range from GREEN to RED.

ICAO Colour Code

Status of Volcano's Activity

GREENVolcano is in normal, non-eruptive state. Or, after a change from a higher level: Volcanic activity considered to have ceased, and volcano reverted to its normal, non-eruptive state.
YELLOWVolcano is experiencing signs of elevated unrest above known background levels. Or, after a change from a higher level: Volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
ORANGEVolcano is exhibiting heightened unrest with increased likelihood of eruption. Or: Volcanic eruption is underway with no or minor ash emission.
REDEruption is forecast to be imminent with significant emission of ash into the atmosphere likely. Or: Eruption is underway with significant emission of ash into the atmosphere.
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