A man wears a mask as he rides a becak, a kind of rickshaw, on a road covered with from Mount Kelud in Yogyakarta. (Photo by Dwi Oblo/Reuters)

Indonesian workers cover the famous Borobudur temple to protect it from volcanic ash from the Mount Kelud volcano eruption in Magelang, Central Java. (Photo by EPA/Assabili)

A women walks on a road covered with volcanic ash following an eruption of Mount Kelud, in Yogyakarta. (Photo by Slamet Riyadi/AP Photo)

A residential area is covered with ash from the Mount Kelud volcano, in Yogyakarta. (Photo by Bimo Satrio/EPA)

A man covered with ash from Mount Kelud is seen on his motorcycle in Yogyakarta. (Photo by Dwi Oblo/Reuters)

Indonesian students walk on a street covered with volcanic ash following an eruption of Mount Kelud, in Yogyakarta. (Photo by Slamet Riyadi/AP Photo)

The runway of Adi Sucipto International airport is covered with ash in Yogyakarta. (Photo by AFP Photo/Rex Features)

A housing complex is seen covered with ash from Mount Kelud, in Yogyakarta. (Photo by Dwi Oblo/Reuters)

Indonesian soldiers evacuate ash covered residents in Malang, East Java province on February 14, 2014 moments after Mount Kelud, considered one of the most dangerous volcanoes on densely populated Java, erupted. Hundreds of thousands of Indonesians were ordered to evacuate and three international airports were closed on February 14 after a volcano on the main island of Java erupted spectacularly, hurling red-hot ash and rocks. (Photo by Aman Rochman/AFP Photo)

Indonesian airport personnel inspect volcanic ash covered planes and the airport of Yogyakarta about 200 kilometers (124 miles) west of the Mount Kelud volcano in East Java province following its eruption on February 14, 2014. A spectacular volcanic eruption in Indonesia has killed at least two people and forced mass evacuations, disrupting long-haul flights and closing international airports Friday. (Photo by AFP Photo/NINOY)

A women rides a motor bike on a street covered with volcanic ash from an eruption of Mount Kelud, in Solo, Indonesia, Friday, February 14, 2014. A major volcanic eruption in Indonesia blasted clouds of ash and debris 18 kilometers (12 miles) into the air on Friday, forcing authorities to close six airports, cancel flights elsewhere in Southeast Asia and evacuate more than 100,000 people from the mountain. (Photo by Hafidz Novalsyah/AP Photo)