More than 120,000 people have been evacuated from near Mount Agung after volcanologists warned that an eruption is imminent.
Residents across the island have been told that they should wear face masks due to the risk of volcanic ash.
Kasbani, the head of Indonesia’s volcanology centre, warned that the dangerous ash can travel anywhere depending on wind direction and the size of the eruption.
Volcanologist Dr Janine Krippner tweeted: “Volcanic ash can spread much more broadly than the immediate pyroclastic flow hazard.
“Kasbani explained, ash and volcanic ash is different from the ordinary dust – volcanic ash is shaped glass and crystals, that when viewed under a microscope, is very sharp.
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“That is why, when volcanic ash enters the human body, it can cause irritation in the body.”
Dr Krippner, who is not based in Bali but has been translating official updates, reiterated that it is impossible to predict when the eruption will happen.
She added: “However, in the event of an eruption in these weeks, the wind and volcanic ash may lead to the northwest.
“And if the eruption is big, it can get to the other side of the island.
“Although wind direction is currently to the northwest, this does not rule out volcanic ash being directed to the east and south.
“The direction of the ash plume to the northwest may be thicker and faster, while the other direction could be thinner.”
Officials have put in place a 12km exclusion zone around the volcano, which has begun to spew thick white smoke.
More than 1,000 earthquakes have been recorded since Monday after authorities raised the volcano warning to the highest possible level.
Mount Agung has not erupted since 1963, when it killed more than 1,100 people and remained active for about a year.