Singapore Air Quality Hits Unhealthy Range as Indonesian Smoke Drifts In

Singapore’s air quality deteriorated sharply on Saturday morning as smoke from Indonesian wildfires pushed the Pollutant Standards Index (PSI) into unhealthy territory. The 24-hour PSI in central Singapore reached 102 at 11am on October 3, exceeding the unhealthy threshold of 101. The National Environment Agency (NEA) attributed the decline to moderate to dense smoke plumes from southern Sumatra and fires in Kalimantan drifting toward Singapore under prevailing southeasterly and southwesterly winds.

Central Singapore PSI climbs to 102 as haze returns

The 24-hour PSI in central Singapore hit 102 on Saturday morning, crossing into the unhealthy range for the first time since September 30. At 11am, PSI readings across the island ranged from 76 in the north to 102 in the central region, with the east at 94 and west at 91. By 5pm the same day, central Singapore’s PSI had risen further to 104, the highest reading of the day. The one-hour PM2.5 concentration, which reflects immediate air quality, reached 63 in central Singapore and 66 in the east, both in the elevated band.

Indonesian fires drive transboundary smoke toward Singapore

The NEA reported moderate to dense smoke plumes from southern Sumatra drifting toward Singapore and the surrounding region. Smoke haze was also observed from fires in Kalimantan. Data from the ASEAN Specialised Meteorological Centre showed hotspots in Kalimantan increased slightly from 227 on October 1 to 232 on October 2. Sumatra saw a sharper spike, with 232 hotspots detected on October 2, up from 127 a day earlier.

Dry weather and strengthening winds forecast to worsen haze through Sunday

The NEA forecast dry weather to persist over Singapore and the surrounding region on Sunday with prevailing southeasterly or southwesterly winds expected to strengthen. The agency warned the 24-hour PSI is forecast to remain in the high-moderate to low-unhealthy range. This combination of conditions creates a continued risk of smoke haze affecting Singapore through the weekend.

NEA health advisories for vulnerable groups

The NEA advised healthy people to reduce prolonged or strenuous outdoor physical exertion when the 24-hour PSI is in the unhealthy range. Elderly people, pregnant women, and children should minimise such activity, while people with chronic lung or heart disease should avoid it entirely. The health impact of haze depends on a person’s health status, the PSI level, and the length and intensity of outdoor activity. For immediate outdoor activities, the public should refer to one-hour PM2.5 readings; for next-day planning, use the 24-hour PSI forecast.

Final Thoughts

Singapore faces continued air quality challenges through Sunday as Indonesian smoke persists. With central Singapore’s PSI at 104 and forecasts pointing to high-moderate to low-unhealthy levels, vulnerable populations should limit outdoor activity and monitor real-time PM2.5 readings.

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