Singapore woke to an acrid orange haze this week as smoke from raging wildfires in Indonesia drifted across the Strait, pushing air quality into unhealthy territory. Schools kept children indoors, outdoor workers donned masks, and health authorities urged vulnerable groups to stay inside as the city-state confronts another season of transboundary pollution.
PSI Spikes Into Unhealthy and Very Unhealthy Zones
Singapore’s National Environment Agency (NEA) reported that the 24-hour Pollutant Standards Index (PSI) climbed above 150 in several districts, breaching the “unhealthy” threshold, with hourly PM2.5 readings spiking even higher during the worst episodes. Visibility dropped sharply, the skyline faded behind a grey-yellow veil, and residents complained of stinging eyes, sore throats, and breathing difficulty.
Health advisories recommend that the elderly, children, pregnant women, and people with heart or lung conditions avoid outdoor exertion when PSI exceeds 100. At higher readings, even healthy adults are advised to cut back on prolonged outdoor activity. Pharmacies reported a run on N95 masks and air purifiers as demand surged.
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Indonesia’s Peatland Fires: The Root Cause
The smoke originates primarily from forest and peatland fires in Sumatra and Kalimantan, where dry conditions linked to El Nino patterns have turned carbon-rich peat soils into tinderboxes. Peat fires are notoriously difficult to extinguish because they smoulder underground for weeks, releasing thick smoke laden with fine particulate matter.
Indonesian authorities have deployed water-bombing helicopters, ground crews, and cloud-seeding operations to douse the blazes. Thousands of hotspots have been detected by satellite. Officials blame a mix of slash-and-burn land clearing by plantations and smallholders, illegal logging, and prolonged drought — a familiar, frustrating cocktail that returns almost every dry season.
Environmental groups argue that enforcement against companies and individuals behind illegal burning remains weak. They point to drainage of peatlands for agriculture as a structural driver: drained peat dries out, oxidises, and becomes extraordinarily flammable. Rewetting degraded peatlands, they say, is the only durable fix.
Health Impacts: More Than Just Discomfort
Doctors warn that haze exposure is far more than an inconvenience. Fine particles (PM2.5) penetrate deep into the lungs and bloodstream, aggravating asthma, triggering heart events, and increasing respiratory infections. Studies of past haze episodes in Southeast Asia have linked them to thousands of excess deaths across the region and billions of dollars in economic losses.
Hospitals in Singapore typically see a rise in haze-related visits during severe episodes. General practitioners advise patients with chronic conditions to stock up on medication, use air purifiers, and monitor official air-quality readings rather than relying on how the sky looks. Employers are encouraged to adjust outdoor work schedules and provide protective equipment.
Children are especially vulnerable because they breathe faster and spend more time outdoors. Parents have flooded school messaging groups with questions about closures, indoor recess policies, and whether air-conditioned classrooms offer enough protection.
Economic and Social Disruption
The haze disrupts far more than lungs. Outdoor construction slows, food-delivery riders brave hazardous air, tourism takes a hit as the city’s gleaming skyline disappears, and major outdoor events face cancellation or postponement. Past severe haze years cost Singapore hundreds of millions of dollars in health spending and lost productivity.
The disruption extends across borders. Parts of Malaysia have also reported deteriorating air quality, and regional airlines have warned of possible flight delays if visibility worsens. The annual haze season has become a recurring drag on the economies of multiple Southeast Asian nations.
Diplomacy and the Search for Lasting Solutions
Singapore has repeatedly pressed Indonesia at ASEAN meetings for stronger action on transboundary haze, including ratification and enforcement of agreements, satellite data sharing, and legal action against errant companies, including Singapore-linked firms. Indonesia has at times bristled at outside pressure, insisting it is doing its best against difficult conditions.
The ASEAN Agreement on Transboundary Haze Pollution, in force for two decades, provides a cooperation framework, but critics say it lacks teeth. Proposals for a regional haze monitoring centre with real enforcement power, a shared firefighting fund, and binding peatland protection targets have circulated for years without full implementation.
Climate change adds urgency: hotter, drier dry seasons are making peat fires larger and harder to control. Scientists warn that without peatland restoration at scale, haze episodes will intensify.
What Residents Can Do Now
Authorities advise residents to check the NEA’s hourly PSI and PM2.5 readings, keep windows closed, run air purifiers, drink plenty of water, and wear N95 masks outdoors when readings are elevated. Those with respiratory symptoms should seek medical attention promptly rather than waiting for the haze to clear.
Schools have activated haze management plans, moving activities indoors and suspending outdoor physical education when thresholds are crossed. Employers with outdoor workforces are expected to follow Ministry of Manpower guidelines on haze protection.
Frequently Asked Questions
What is causing the haze in Singapore right now?
Smoke from forest and peatland wildfires in Indonesia’s Sumatra and Kalimantan regions, carried by prevailing winds, is the primary cause of the current haze episode.
Is the air quality dangerous?
PSI readings in the unhealthy range (above 100) pose risks to sensitive groups; readings above 200 are considered very unhealthy for everyone. Check hourly official readings before going outdoors.
How can I protect myself during the haze?
Stay indoors when possible, use air purifiers, keep windows closed, wear an N95 mask outdoors, stay hydrated, and seek medical help if you develop breathing difficulty.
Will the haze end soon?
Haze typically clears when winds shift or rains arrive in the fire-affected regions. Firefighting efforts, weather changes, and regional cooperation all influence how long episodes last.