More than 500,000 Indonesians are said to be suffering from acute respiratory infection after having been exposed to fire-induced haze for months.
The smoke was caused by forest fires that got out of hand after being used to clear land for agriculture.
The haze has spread to Singapore, Malaysia, Thailand and the Philippines.
Experts have warned that this year's incident could be one of the worst, surpassing similar cases in 1997 and 2013.
