Indonesian wildfires blanket region in toxic smog, forcing school closures across Southeast Asia

The smoke has been rolling across Southeast Asia for months now, and by early October it had reached a breaking point. Forest fires burning across Indonesia's Kalimantan and Sumatra regions had drifted into neighboring Malaysia, Brunei, and the Philippines, but Singapore felt the weight of it most acutely. The city-state's air quality index—a measure tracking six key pollutants over a rolling 24-hour period—climbed to 170 in central areas, the worst reading of the year. The scale runs from zero to 500. Anything above 101 enters "unhealthy" territory. At 170, Singapore had crossed well into that zone, and the visible world was shrinking. A reporter commuting to work that morning watched pedestrians hurrying through the haze with faces shielded, masks pulled tight. The colorful apartment blocks that normally line the daily route had vanished into a gray-white blanket. Across the island, other neighborhoods registered readings between 117 and 166.

This was not a new crisis, but it had become an urgent one. Indonesia has battled wildfires annually for years, most driven by slash-and-burn clearing—a cheap method farmers and companies use to strip vegetation from land. But the conditions in 2026 were worse than they had been since 2015. A super El Niño had brought prolonged dry weather to the region, turning forests into kindling. The fires that followed were among the most severe Indonesia had faced in over a decade, and the smoke they produced was thick enough to cross borders and settle over millions of people who had nothing to do with starting them.

Indonesian authorities responded with scale. Tens of thousands of personnel were deployed across six priority zones in Kalimantan and Sumatra. They fought fires on the ground and from the air—helicopters water-bombed burning areas while cloud-seeding operations attempted to coax rain from the sky. Japan and Malaysia sent assistance. Yet the fires persisted. Official data showed hotspot counts fluctuating, declining for a stretch, then rising again. The blazes simply would not break.

The political response came from the top. President Prabowo Subianto, facing public anger, pledged firm action against corporations found responsible. Authorities revoked permits for five companies accused of contributing to the fires. Dozens more had their permits frozen. Environmental groups, however, pushed harder, demanding stricter consequences for illegal burning activities and corporate involvement. The fires, they argued, were not just a weather problem—they were a governance problem.

The human toll rippled outward in ways both visible and invisible. Singapore's National Environment Agency began issuing regular advisories in early September, the first time the air had entered the unhealthy range since 2023. The public was urged to stay hydrated and limit time outdoors. Schools were instructed to reduce prolonged outdoor activities. Some received air purifiers for classrooms. Across the region, similar restrictions took hold in Malaysia and elsewhere as residents breathed air that was not safe to breathe.

Local authorities offered a grim timeline. The fires could continue burning until early November, they warned, because the rainy season had arrived late. Until the rains came in force, the smoke would linger. The region was trapped in a holding pattern—waiting for weather, waiting for fires to exhaust themselves, waiting for air that could be breathed without precaution. The immediate crisis was not one that could be solved by personnel or helicopters alone. It would take the season to turn.