Indonesia’s fires are spreading. Cloud seeding cannot stop them.

Wildfires across 10 Indonesian provinces have burned more than 107,000 hectares as of August 10, 2026, with transboundary smoke pushing air quality to unhealthy levels in parts of Malaysia and Singapore. The most effective suppression tool, cloud seeding, is unavailable because a Super El Niño and positive Indian Ocean Dipole have stripped the atmosphere of suitable clouds.

The crisis is unfolding weeks before the traditional peak of the fire season. The ASEAN Specialised Meteorological Centre has raised its regional haze alert, and forecasters warn conditions could rival the deadly 2015 season that exposed millions to toxic air.

The fires now burning across Indonesia are not simply a weather event. They are a land-management system meeting a climate ceiling, and the bill is arriving in neighbouring countries before Jakarta has finished counting the hectares. The atmospheric setup — a Super El Niño combined with a positive Indian Ocean Dipole — has removed cloud seeding from the response toolkit. That leaves ground crews and water-bombing helicopters as the only suppression options, with peak burning months still ahead.

In Sarawak, nine districts recorded Air Pollutant Index readings above Malaysia’s unhealthy threshold of 100 on August 9. Serian hit 180. Across the border in Singapore, the 24-hour Pollutant Standards Index reached 81, placing it in the moderate range but close to the trigger for a 28-agency task force to activate action plans. The smoke is already crossing borders. The question is what happens when the fires intensify, and the treaty meant to manage this crisis still cannot compel accountability across them.

The tool Indonesia cannot use

Indonesia has deployed 43 helicopters and ground crews across all 10 affected provinces in what officials describe as a maximum-response posture. But the country’s most effective aerial method — cloud seeding — is grounded. Coordinating Minister for Political and Security Affairs Djamari Chaniago reported that BMKG monitoring found no rain-bearing clouds suitable for weather modification through at least August 18.

Forestry Minister Raja Juli Antoni said while visiting Mount Bromo on Sunday that the consequence was direct: “We are relying solely on water bombing and ground firefighting teams.” The admission matters because it removes the one tool that can treat large areas before ignition, rather than chasing fires after they start.

In a July 28 cabinet meeting, BMKG head Teuku Faisal Fathani stated that the agency prioritizes weather modification to refill reservoirs and wet fire-prone land, but only when suitable clouds exist. The current atmosphere offers no such window.

Over the three days prior to August 10, the ASEAN Specialised Meteorological Centre detected 905 hotspots in Kalimantan against six in Sarawak, establishing Indonesia as the primary source of the smoke now affecting Malaysian territory. In Jambi, Sumatra, more than 50 hectares of peatland have burned since Wednesday, destroying oil palm plantations. Deep peat soil, limited water, difficult terrain, and strong winds have impeded ground crews despite three helicopters conducting water-bombing runs.

The hotspot count is already running ahead of 2015. By late July, the satellite platform FireWatch had recorded more than 96,000 fire hotspots nationwide — a figure exceeding any previously recorded total at the same calendar point in 2015, 2019, or 2023. The comparison is not a forecast, but it is a warning.

A treaty that coordinates but cannot compel

The ASEAN Agreement on Transboundary Haze Pollution, signed in 2002, was designed for exactly this moment. It supports information-sharing and requests for assistance between member states. A new Coordinating Centre for Transboundary Haze Pollution Control was inaugurated in 2024, and a second Haze-Free Roadmap runs through 2030. Neither creates enforcement authority.

The gap is structural. Indonesia’s current response leans on emergency firefighting, not new legal powers. The policy architecture can coordinate a response, but the fire drivers on land — slash-and-burn clearing for palm oil and timber concessions — remain largely outside binding regional control. Pantau Gambut and Madani Berkelanjutan documented more than 28,000 peatland hotspots in the first half of 2026, including 1,617 within oil palm cultivation rights areas in West Kalimantan alone.

In June 2026, Simon Tay, chairman of the Singapore Institute of International Affairs, argued that ASEAN needs stronger ownership of the haze problem. The institute issued a Red haze rating for 2026 in June — only the second such rating since the report’s 2019 launch — identifying August and September as the peak danger period. The rating is a risk assessment, not a regulatory instrument. The treaty it points to has no teeth.

The atmospheric measurements explain why this moment is dangerous. BMKG reports that the 2026 El Niño is running with Pacific temperature anomalies of 1.5°C to 2.0°C above normal, while a positive Indian Ocean Dipole is suppressing rainfall across maritime Southeast Asia. The agency projects suppressed rainfall through at least October 2026 in Kalimantan, Sumatra, Jambi, and West Kalimantan. Those conditions describe the same setup that drove the 2015 fires, which burned approximately 4.6 million hectares and exposed 69 million people to unhealthy air quality.

The 2015 season resulted in an estimated 6,150 to 17,270 premature deaths, according to a peer-reviewed study in Scientific Reports. A separate Harvard-Columbia study estimated up to 100,300 deaths; that figure was disputed by the governments of Indonesia, Malaysia, and Singapore. The range itself is part of the story: even the lower bound counts lives lost to a disaster driven by land-use choices, not just weather. The current hotspot count is already ahead of 2015 at the same calendar point. Peak burning months are still ahead. The tool that might have reduced the toll is grounded. And the treaty that might have prevented the ignition pressure remains a coordination mechanism, not a constraint.

Beyond the headline

The Bigger Picture

This is not simply a weather crisis. It is a land-management system running into a climate ceiling. When drought compresses the margin for control, the cost of routine burning jumps from local nuisance to cross-border emergency. The atmospheric conditions are extreme, but the ignition sources are not accidental — they are embedded in how land is cleared for profit.

The Money Trail

The economic logic still points toward land conversion. Fire remains the cheapest fast-clearance method where enforcement is weak. That incentive survives even when the public costs are regional, which is why the burden lands on neighbours and health systems instead of the operators who benefit first.

What Isn’t Being Said

The dominant official frame emphasises suppression capacity. The harder question is why ignition pressure keeps reappearing on the same land-use frontiers. Once the focus shifts to recurring clearing incentives, the story becomes less about one bad season and more about a persistent accountability gap that ASEAN’s treaty architecture was never designed to close.

The decisions that follow the smoke

With peak burning months still ahead and no aerial seeding relief available, four groups face immediate choices.

• Western tourist planning Southeast Asia travel

  Monitor the National Environment Agency’s haze updates for Singapore and Malaysia’s Department of Environment for Sarawak air-quality notices over the next week. PSI and API readings will determine whether outdoor activities are safe. Airline operations and destination health warnings typically move before formal shutdowns, so check carrier policies on cancellation and rebooking.

• Supply chain manager with Indonesian palm oil or timber exposure

  Assess supplier exposure in West Kalimantan and Jambi, where peatland fires are active and documented within oil palm concessions. Review contractual force majeure clauses related to environmental disasters. Alternative sourcing options should be explored now, before peak burning months tighten supply further.

• Expat or remote worker based in Singapore or Malaysia

  Track local API and PSI readings daily. When readings cross unhealthy thresholds, limit outdoor exertion, use indoor filtration where available, and follow health advisories prioritising children, older adults, pregnant people, and those with heart or lung conditions. The 28-agency Singapore task force activates if PSI crosses 100 — a threshold already within reach.

• ESG investor with exposure to Southeast Asian agriculture or forestry

  Scrutinise portfolio companies’ land management practices and fire prevention strategies in Indonesia. The 1,617 hotspots documented within oil palm cultivation rights areas in West Kalimantan alone represent a concentration of risk. The reputational and regulatory exposure is rising as the haze crosses borders and the treaty framework proves unable to assign accountability.

FAQ

Explainer

El Niño

A climate pattern driven by warming Pacific Ocean surface temperatures that weakens trade winds and reduces rainfall over maritime Southeast Asia. The 2026 event is classified as a Super El Niño, with temperature anomalies of 1.5°C to 2.0°C above normal. The last Super El Niño in 2015 produced Indonesia’s deadliest fire season on record.

Indian Ocean Dipole

A sea-surface temperature gradient across the Indian Ocean. A positive phase cools waters near Sumatra and Java, establishing a high-pressure system that further suppresses rainfall. When it coincides with an El Niño, as in 2026, the combined drying effect removes the atmospheric moisture needed for cloud seeding.

Cloud seeding

A weather modification technique that disperses substances into existing clouds to encourage rainfall. It cannot create clouds where none exist. Indonesia uses it to wet peatlands and refill reservoirs before fires start, making its current unavailability a structural loss of suppression capacity rather than a temporary inconvenience.

AATHP

The ASEAN Agreement on Transboundary Haze Pollution, signed in 2002, coordinates monitoring and mutual assistance between member states during haze crises. A Coordinating Centre was inaugurated in 2024 and a second Haze-Free Roadmap adopted through 2030. Neither instrument includes binding sanctions or the authority to compel a member state to prosecute domestic actors.