PUBLISHED ONSeptember 26, 2026 10:26 AMUPDATEDSeptember 26, 2026 12:45 PMBYSean LerAir quality returned to the unhealthy range in central Singapore on Saturday (Sept 26) evening, with a 24-hour Pollutant Standards Index (PSI) reading of 104.
At 8pm, PSI ranged from 74 to 104 — in the moderate to unhealthy range. Readings of between 101 and 200 denote the unhealthy range.
Meanwhile, one-hour PM2.5 is in the elevated band in central (110), eastern (88), western (82) and southern (67) Singapore. Only the Republic’s northern region (50) remains in the normal band.
In its daily haze situation update on Saturday evening, the National Environment Agency (NEA) had said the country's 24-hour PSI forecast is expected to be in the moderate to low-unhealthy range.
It pointed out that moderate to dense smoke haze from fires in Kalimantan drifted towards Singapore on Saturday, while smoke plumes were also observed from fires in southern Sumatra.
Along with the prevailing south-easterly or south-westerly winds, there could be a risk of smoke haze affecting Singapore, the agency explained.
It also noted that dry conditions are expected to continue over southern Sumatra and the southern and eastern parts of Kalimantan.
Members of the public should note that the health impact of haze is dependent on one’s health status, the PSI level, and the length and intensity of outdoor activity.
When PM2.5 readings are in the elevated band, members of the public should reduce strenuous outdoor activity for the next hour.
Vulnerable persons such as the elderly, pregnant women, children, and persons with chronic lung or heart disease should avoid strenuous outdoor activity.
However, if readings hit the high-band, all healthy persons should avoid strenuous outdoor activity for the next hour, while vulnerable persons should avoid all outdoor activity.
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