The Indonesian government has blamed small farmers for starting fires to clear land. But environmental groups say the government is failing to enforce logging regulations and a ban on land-clearing fires.
A smoke haze is threatening to disrupt air traffic and is said to be causing health problems for people in nearby Malaysia and Singapore.
The latest reports identify more than 100 fires in Kalimantan, the Indonesian part of Borneo, with tens of thousands recorded over the past month. Some 60% of the burned area is farmland, with the rest forest.
However, the Indonesian Forum for the Environment claims big companies converting forest land for plantations or industrial uses are the biggest problem.
