Indonesia Identifies 139 Suspects as Severe Wildfires Threaten Millions Across the Region

Volunteers in West Kalimantan are delivering oxygen cylinders door to door to residents and firefighters through a campaign called āRumah Oksigen,ā or āOxygen House.ā A Pontianak clinic reported 187 cases of breathing difficulties in the first 11 days of September, compared with 422 cases during all of August, with daily visits later reaching 80 to 120.
Malaysiaās worst air-quality reading was recorded in Serian, Sarawak, at an Air Pollutant Index level of 188 on Sept. 15. The district had earlier declared the countryās first haze-related state of emergency this year after its index exceeded 500 on Sept. 4; the emergency was lifted three days later when conditions improved.
Japanās deployment marks the first time its Self-Defense Forces have participated in overseas fire-suppression operations. The transport vessel carrying three helicopters was expected to begin firefighting on Sunday.
Several municipalities in Kalimantan shifted classes online to protect students from smoke pollution, illustrating a direct disruption to education beyond the broader health effects of the fires.
Riau police said fires were still burning at 10 locations, with some blazes continuing for 10 days. The provinceās enforcement campaign is being conducted alongside routine patrols, early detection and public outreach about the ban on clearing land by burning.
Indonesia is battling its worst wildfire season in 11 years, with more than 202,000 hectares burned across 36 provinces by late July. Market Screener reports that El NiƱo and prolonged drought have fueled the blazes, which have now exposed over 12.5 million people to hazardous smoke across seven provinces. Authorities have identified approximately 139 suspects linked to roughly 200 fire cases, including 49 suspects accused of arson in Riau province alone.
The smoke has triggered a public health emergency. Head Topics reports that a clinic in Pontianak recorded 187 breathing-difficulty cases in just 11 days of Septemberānearly half the 422 cases reported throughout August. Daily clinic visits later climbed to 80 to 120 patients. Volunteers in West Kalimantan have launched an emergency program called "Rumah Oksigen," or "Oxygen House," delivering oxygen cylinders door-to-door to residents and firefighters.
Malaysia's air quality has deteriorated sharply. Serian, Sarawak recorded an Air Pollutant Index of 188 on September 15. Just days earlier, on September 4, the index had spiked above 500, forcing the district to declare the country's first haze-related state of emergency. The emergency ended three days later when conditions improved.
Riau has become the enforcement focal point. Police identified 49 suspects linked to 45 alleged arson cases as wildfires burned more than 19,000 hectares in the province this year. Investigators are examining possible corporate involvement in some blazes. Riau police reported that fires were still burning at 10 locations, with some fires continuing to burn for 10 days straight.
The crisis has disrupted education. Several municipalities in Kalimantan shifted classes online to shield students from smoke pollution. Meanwhile, Japan's Self-Defense Forces are mounting their first-ever overseas fire-suppression operation. A transport vessel carrying three helicopters was expected to begin firefighting operations on Sunday, providing critical aerial support to Indonesian forces battling blazes across East Java's seven affected mountains.
Indonesian authorities are combining criminal prosecutions with prevention measures. The government is conducting routine patrols, implementing early-detection systems, and launching public education campaigns about the ban on land clearing by burning. Officials aim to discourage the practice and prevent further destruction. These efforts address both immediate threats and long-term behavior change needed to reduce future fire seasons.
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