
The front glass of a bus is partly covered by volcanic ash spewed by Mount Sinabung in Karo, North Sumatra, Indonesia, on Aug. 2, 2017. (Xinhua/YT Haryono)

The front glass of a bus is partly covered by volcanic ash spewed by Mount Sinabung in Karo, North Sumatra, Indonesia, on Aug. 2, 2017. (Xinhua/YT Haryono)