Each September, Singapore is reminded that its air is not entirely its own. Smoke rising from fires across Sumatra and Kalimantan drifts westward on the wind, crossing the Strait of Malacca to settle over a city-state that can measure the intrusion precisely but cannot stop it at the border. On the morning of September 10, the Pollutant Standards Index reached 105 in central Singapore — the second unhealthy episode in a single week — placing the health of millions in the hands of weather patterns and fire conditions far beyond their shores.
Singapore's air quality slips back into unhealthy range amid regional haze
Air quality in unhealthy range poses respiratory health risks to Singapore's population, particularly vulnerable groups.
Unhealthy is unhealthy. It means the air itself becomes a public health concern.
Mark
So this is the second time in a week that Singapore's air hit unhealthy levels. What changed between September 5, when it dropped back to moderate, and now?
Mimi
The fires in Sumatra and Kalimantan never stopped. The agency said dry conditions would likely continue in those regions, which means the fires kept burning and kept producing smoke. The wind just carried it back toward Singapore.
Luke
But we don't actually know if the same fires are still burning, or if new fires started. The source says smoke plumes are being detected, but it doesn't tell us whether the fire activity increased or just shifted.
Mimi
That's fair. What we know is that the conditions that allow fires to spread—dryness—are expected to persist in Kalimantan and southern Sumatra. That's the real risk factor.
Mark
The forecast says the PSI will stay in the high-moderate to low-unhealthy range. That's a pretty wide band. Does that mean it could get worse?
Mimi
It could. The range goes from about 51 to 150, so technically it could climb higher. But the agency isn't predicting it will reach the very unhealthy category, which starts at 201.
Luke
Though they also said showers are expected in parts of Sumatra, which could help. So there's a lot of uncertainty baked into that forecast.
Mark
What does unhealthy actually mean for people living there?
Mimi
It means the air poses a health risk, especially for vulnerable groups—elderly people, children, anyone with asthma or other respiratory conditions. It's a signal to limit outdoor activity.
Luke
And it's worth noting that Singapore is a wealthy city-state with good air quality monitoring. Many people in the regions where the fires are actually burning don't have that same visibility into what they're breathing.
Mark
So this is really a transboundary problem.
Mimi
Exactly. The fires are in Indonesia, but the smoke crosses borders. Singapore can measure it and issue advisories, but it can't control the fires themselves.
El Pulso
- Central Singapore's PSI climbed to 105 by Thursday morning, crossing the unhealthy threshold for the second time in a week after a brief and fragile reprieve.
- Dense smoke plumes from fires burning across southern Sumatra and Kalimantan are riding prevailing winds directly into Singapore's airspace, making this a regional crisis with a local face.
- The city's most recent peak — a PSI of 123 on September 4, the highest since 2023 — has already triggered daily haze advisories, putting health authorities on sustained alert.
- Vulnerable populations including the elderly, children, and those with respiratory conditions face genuine health risks as outdoor activity advisories take hold across the island.
- Rain forecast for parts of Sumatra offers limited hope, but continued dry conditions in Kalimantan and southern Sumatra mean the fires — and the haze — show little sign of relenting soon.
Each September, Singapore is reminded that its air is not entirely its own. Smoke rising from fires across Sumatra and Kalimantan drifts westward on the wind, crossing the Strait of Malacca to settle over a city-state that can measure the intrusion precisely but cannot stop it at the border. On the morning of September 10, the Pollutant Standards Index reached 105 in central Singapore — the second unhealthy episode in a single week — placing the health of millions in the hands of weather patterns and fire conditions far beyond their shores.
Singapore woke Thursday to air thick with smoke. By 8am, the National Environment Agency recorded a Pollutant Standards Index of 105 in the central region — officially unhealthy, and the second time in a week the city had crossed that line. The overnight climb had been gradual but unmistakable: 102 at 11pm, 104 by 6am, and then over the threshold.
The source was distant but familiar. Fires burning across southern and central Sumatra and Kalimantan were sending dense smoke plumes westward across the Strait of Malacca. Singapore was not generating this crisis — it was simply downwind of one.
The deterioration had begun earlier in the month. On September 4, the PSI in central Singapore spiked to 123, the highest reading recorded there since 2023, prompting daily haze advisories. By the evening of September 5, the index had retreated to moderate levels — but the relief lasted only five days before unhealthy conditions returned.
What comes next hinges on weather Singapore cannot control. Forecast showers over parts of northern and central Sumatra may suppress some fire activity, but Kalimantan and southern Sumatra — the primary sources of the smoke — face ongoing dry conditions. The agency's outlook is measured: PSI levels are likely to hover in the high-moderate to low-unhealthy range, a band that offers little comfort to the elderly, children, and those with respiratory conditions for whom unhealthy air is not an abstraction but a daily health calculation.
Singapore woke Thursday morning to air thick enough to measure. By 8am, the National Environment Agency had recorded a Pollutant Standards Index of 105 in the central region—a number that carries official weight: unhealthy. It was the second time in a week that the city-state's air had crossed that threshold.
The climb had been steady. The night before, at 11pm, the PSI stood at 102. By 6am it was 104. The trajectory was clear. Elsewhere on the island, readings remained moderate, but the central corridor—where the densest population lives and works—had slipped back into the danger zone.
The culprit was familiar and distant at once. Smoke plumes, some of them dense, were rising from fires burning across the Indonesian archipelago: in southern and central Sumatra, in Kalimantan. The wind was carrying that smoke westward, across the Strait of Malacca, into Singapore's airspace. This was not a local problem. It was a regional one, and Singapore was downwind.
The National Environment Agency had been tracking the deterioration since early September. On September 4, the PSI in central Singapore had spiked to 123—the highest reading recorded there since 2023. That breach had triggered daily haze advisories starting that evening. For a day the unhealthy conditions persisted. By 9pm on September 5, the index had retreated back to moderate. But the respite was brief. Now, five days later, the unhealthy range had returned.
What happens next depends on weather patterns beyond Singapore's control. The agency forecast that showers would arrive over parts of central and northern Sumatra in the coming days—rain that could suppress the fires or at least slow their spread. But Kalimantan and southern Sumatra, where much of the smoke was originating, faced continued dry conditions. If fires persisted there, so would the haze. The forecast for Singapore's air was cautious: the PSI would likely remain in the high-moderate to low-unhealthy range, a band of readings that encompasses both 101 and 150, both the threshold of unhealthy and something worse.
For context: a PSI between 101 and 200 is classified as unhealthy. Between 201 and 300 is very unhealthy. Above 300 is hazardous. Singapore had not reached those extremes this week, but the trend was worth watching. The city had experienced far worse in previous years. Still, unhealthy is unhealthy. It means vulnerable populations—the elderly, children, people with respiratory conditions—face genuine risk from prolonged exposure. It means advisories to limit outdoor activity. It means the air itself becomes a public health concern, not merely an inconvenience.
Citas Notables
Smoke plumes ranging from moderate to dense continued to be detected from fires in southern and central Sumatra and Kalimantan, with some haze drifting towards Singapore.— National Environment Agency
Quieres la nota completa?
Lee el original en Malay Mail ↗
General News