Sumatra Island

In this photograph taken on June 3, 2015...In this photograph taken on June 3, 2015, an Indonesian farmer in Karo district looks at Mount Sinabung volcano spewing smoke and ash. Nearly 3,000 people have been evacuated from their homes after Indonesia upgraded the threat posed by a volcano on Sumatra island to the highest possible level, an official said on June 4, 2015.  AFP PHOTO / SUTANTA ADITYASUTANTA ADITYA/AFP/Getty Images

Sutanta Adita/AFP/Getty

An Indonesian farmer in Karo district watches the Mount Sinabung volcano erupting. Thousands of people have been evacuated from their homes after Indonesia upgraded the threat posed by the volcano on Sumatra island to the highest level.

Firefighters Attempt To Extinguish Forest Fires...SUMATRA ISLAND, INDONESIA - JUNE 27:  A woman walks trough haze as a forrest fire burns bushes and fields June 27, 2013 in Siak Regency, Riau Province, Indonesia. The fires on Sumatra have caused record smog in Malaysia and Singapore. Sumatra has stepped up efforts to fight the fires to relieve the conditions. Eight farmers have been arrested for setting the fires on Sumatra Island.  (Photo by Ulet Ifansasti/Getty Images)

Ulet Ifansasti/Getty

A woman walks through haze as a forest fire burns bushes in Siak Regency, Riau Province, Indonesia on Thursday. The fires in Sumatra have caused record smog in Malaysia and Singapore. Sumatra has stepped up efforts to fight the fires to relieve the conditions. Eight farmers have been arrested for starting the fires.