Each dry season, smoke rises from the burning forests of Borneo and Sumatra, but this year the fires speak with unusual force — amplified by one of the strongest El Niño patterns in four decades and landscapes stripped of their natural resilience by generations of slash-and-burn clearing. Singapore and Malaysia now breathe air that registers as unhealthy by any measure, grounding flights, closing schools, and filling clinics with tens of thousands of the sick. The crisis echoes 2015, but with no clear end in sight, what once felt like a recurring emergency is beginning to resemble a permanent
Southeast Asia choked by Indonesian haze as Firefly extends flight cancellations
Tens of thousands of respiratory illness cases reported across the region due to toxic haze exposure.
The air was still too bad to breathe safely for hours at a time.
Mark
So Firefly cancelled flights on Saturday and extended it through Wednesday—that's almost a week of disruption. How bad does the air have to get before an airline stops flying?
Mimi
The Air Quality Index was at 193 in Singapore. Anything above 150 is unhealthy. But it's not just about the number—visibility matters too. Pilots need to see the runway. And there's liability. If passengers get sick or there's an incident, the airline is exposed.
Luke
Right, but we should note that Firefly didn't release specific visibility data or medical guidance they were following. They said it was a proactive safety measure, which is true, but we don't know exactly what threshold triggered the decision.
Mark
The source says tens of thousands of respiratory cases. That's a big number. Is that confirmed across the region, or is that an estimate?
Mimi
It's reported, but you're right to push back. The source doesn't break it down by country or give a date range. It's the scale of the crisis, but not precisely quantified.
Luke
Exactly. And the fires themselves—we know they're on Borneo and Sumatra, we know El Niño intensified them, we know slash-and-burn practices changed the landscape. But we don't know how many hectares are burning, how many fires, or how long they're expected to burn.
Mark
So the haze could last weeks, like 2015, or it could clear faster?
Mimi
That's the open question. El Niño is expected to remain strong, which suggests the dry conditions will persist. But there's no forecast for when the fires will be contained or when the wind patterns will shift.
Luke
And that's the real story—not just that flights are cancelled, but that the region is caught in a cycle it can predict but can't control. The same subsidy scheme from 2015 is being activated again. That's not progress.
Mark
Schools are closed in some places but open in others. How does a government decide that?
Mimi
Air quality varies by location. Three Malaysian states and one federal territory kept schools closed, but most of Malaysia reopened. It's a local decision based on local air quality readings.
Luke
Though we don't know which states or what their specific AQI readings were. The reporting gives us the regional picture but not the granular one.
El Pulso
- Singapore's air quality index reached 193 — deep in the 'unhealthy' range — forcing the government to revive a medical subsidy program dormant since the last major haze crisis eleven years ago.
- Tens of thousands of respiratory illness cases have accumulated across the region, with children kept home and vulnerable populations warned to stay indoors as the smoke shows no sign of lifting.
- Malaysian airline Firefly extended its flight cancellations between Kuala Lumpur and Singapore's Seletar Airport through Wednesday, citing safety conditions that made landing and passenger welfare impossible to guarantee.
- Malaysia closed schools across three states, one federal territory, and multiple districts, with only a partial reopening on Tuesday as air quality offered a brief, fragile improvement.
- Experts warn that slash-and-burn land-clearing has dismantled the fire-resistant character of older forests, meaning each El Niño season now burns hotter and spreads further than the last.
- With El Niño expected to remain strong, authorities have no clear timeline for relief — the haze is no longer an interruption to normal life but an intensifying seasonal reality.
Each dry season, smoke rises from the burning forests of Borneo and Sumatra, but this year the fires speak with unusual force — amplified by one of the strongest El Niño patterns in four decades and landscapes stripped of their natural resilience by generations of slash-and-burn clearing. Singapore and Malaysia now breathe air that registers as unhealthy by any measure, grounding flights, closing schools, and filling clinics with tens of thousands of the sick. The crisis echoes 2015, but with no clear end in sight, what once felt like a recurring emergency is beginning to resemble a permanent condition.
By early Tuesday, Singapore had earned a grim distinction: among the most polluted cities on earth, with an Air Quality Index of 193. The government responded by reviving a medical subsidy scheme last activated in 2015, designed to help residents afford care for haze-related illness. The threshold for 'unhealthy' air sits at 150. Singapore was well past it.
The fires driving the crisis burned across Indonesian Borneo and Sumatra, their smoke carried north and east into Malaysia and Singapore. Indonesia confronts wildfires every dry season, but this year an exceptionally strong El Niño had intensified the burning far beyond the norm. Compounding the problem, decades of slash-and-burn land-clearing for agriculture and development had eroded the natural fire resistance of older forests, leaving the landscape more vulnerable than ever.
The human cost was quiet but vast. Tens of thousands of respiratory cases were reported across the region. Malaysian schools in three states, one federal territory, and several districts remained closed even as others cautiously reopened Tuesday. The air was still too dangerous for sustained outdoor exposure.
Commerce felt the strain too. Malaysian low-cost carrier Firefly had already suspended its Kuala Lumpur–Singapore route over the weekend; on Monday evening, it extended those cancellations through Wednesday, citing safety conditions that left pilots and passengers at risk. The airline promised updates, but offered no certainty — the fires were still burning, the weather still shifting.
The 2015 haze crisis had eventually passed, and the region had moved on. This one carries a different weight. With El Niño showing no signs of weakening, what has long been treated as a manageable seasonal disruption is beginning to look like something more permanent — a crisis that endures not because solutions are unknown, but because the conditions producing it keep growing stronger.
The haze rolled in from across the water, thick enough to choke a city. By early Tuesday, Singapore had climbed into the world's most polluted air—a ranking that matters when you're a global financial hub trying to move people and goods. The Air Quality Index hit 193, a number that meant the government dusted off a program it hadn't needed since 2015: subsidies for people seeking medical care for haze-related illness. Anything above 150 is classified as unhealthy. Anything above 300 is hazardous. Singapore was breathing air that fell squarely in between.
The source was clear enough. Fires burning across Borneo and Sumatra, in Indonesian territory, were sending their smoke northward and eastward into Malaysia and Singapore. The fires themselves were not new—Indonesia battles them every dry season, a predictable crisis that regional governments have learned to manage, or at least endure. But this year was different. An El Niño weather pattern, one of the strongest in four decades of records, had turbocharged the burning. The landscape itself had changed too. Slash-and-burn land-clearing practices, used to open ground for agriculture and development, had stripped away the natural fire resistance that older forests possessed. The result was a region choking on smoke.
The human toll accumulated quietly in the statistics. Tens of thousands of respiratory illness cases had been reported across Southeast Asia. People were getting sick. Children were staying home from school. In Malaysia, most schools reopened on Tuesday as air quality improved slightly, but three states, one federal territory, and several districts kept their doors closed. The air was still too bad to breathe safely for hours at a time.
The disruption rippled through commerce. Firefly, a Malaysian low-cost carrier, had stopped flying the route between Kuala Lumpur and Singapore's Seletar Airport on Saturday. On Monday evening, the airline announced it was extending those cancellations through Wednesday. The company called it a proactive safety measure—a phrase that meant pilots couldn't see clearly enough to land, or the air quality made flying inadvisable for passengers with respiratory vulnerabilities. The airline promised to keep monitoring and update customers as conditions changed, but there was no certainty in that promise. The weather was still evolving. The fires were still burning.
This had happened before. In 2015, Indonesian fires had cloaked Southeast Asia in toxic smoke for weeks. Schools had closed. Flights had been cancelled. Respiratory cases had spiked. The region had activated the same subsidy schemes, the same emergency protocols. But that crisis had passed. This one was still unfolding, and with El Niño expected to remain strong, there was no clear endpoint in sight. The haze was not a temporary inconvenience. It was a seasonal reality that was becoming harder to predict and harder to endure.
Citas Notables
Given the evolving weather situation, Firefly is monitoring developments closely. Further updates on flight schedules will be communicated directly to affected customers.— Firefly airline statement
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