Mount Barujari in Indonesia's West Nusa Tenggara province erupted on Saturday with the potential of lava flow, officials said.
A powerful burst of hot ash volcanic material erupted up to 1.5 km in the sky and spread from the south to the southwest of the crater, Sutopo Purwo Nugroho, spokesman of the national disaster management agency, said.
"Over 100,000 masks have been distributed to the people in anticipating the impact of the eruption," Sutopo told Xinhua news agency.
Makeshift tents have been put up at nine locations for possible massive evacuation, Sutopo said.
However, the eruption has not disturbed flights.
Bali airport and other airports have been shut down several times from Tuesday to Friday following the eruption of Mount Barujari, Sutopo said.
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Mount Barujari commenced erupting on October 25.
It is one of Indonesia's 129 active volcanoes.