Indonesia has come under growing pressure from its neighbours in recent weeks as thick smoke from fires on Sumatra and the Indonesian part of Borneo has sent pollution levels soaring in Malaysia and Singapore, where schools have been closed and major outdoor events cancelled.
The blazes flare up annually during the dry season as fires are illegally set to clear land for cultivation. But an El Nino weather system has made conditions drier, with this year's haze on track to be the worst on record.
But Indonesia has rejected suggestions it is not doing enough, with the head of the country's disaster agency saying all possible resources were being used.
"We have done the best we can," Willem Rampangilei told reporters.
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"It is understandable if other countries are upset, but we Indonesians are more upset."
Pollution in Singapore and Malaysia has risen beyond hazardous levels since the haze outbreak began last month, while levels more than five times that limit have been recorded on the Indonesian part of Borneo island.
Schools in many parts of Malaysia were closed for a second straight day today, part of a two-day shutdown announced at the weekend as pollution levels soared. Air quality readings were unhealthy along parts of country's west coast facing Sumatra.
The haze spread as far as southern Thailand, where pollution levels were rising fast, prompting junta leader Prayut Chan-O-Cha to call for a regional meeting on the crisis.
"We have to talk with the countries where it (the haze) originates," he said.
Singapore has offered to help combat the fires, volunteering a Hercules plane and IT expertise, but Indonesia has insisted it has the equipment necessary to do the job.
Efforts by more than a dozen helicopters to waterbomb hot spots have several times been thwarted by thick smoke, he added.