PUBLISHED ONSeptember 14, 2026 4:09 AMUPDATEDSeptember 14, 2026 8:06 AMBYSean LerAir quality in Singapore returned to the unhealthy range again at noon on Monday (Sept 14)
At 12pm, the 24-hour Pollutant Standard Index (PSI) reading in central Singapore was 102. A reading of between 101 and 200 denotes the unhealthy range.
Elsewhere in the Republic, 24-hour PSI reading was between 79 and 91, still within the moderate range, with the next highest reading of 91 recorded in eastern and western Singapore.
Meanwhile, the one-hour PM2.5 — an indicator of fine micro-pollutants in the air — is in the elevated range across the city state.
The highest one-hour PM2.5 reading of 100 was also recorded in central Singapore.
Data from the National Environment Agency (NEA) shows that one-hour PM2.5 hit a high of 113 at 10am on Monday.
AsiaOne had earlier reported that the reading was recorded at 107 in the central region at 9am.
This is also the first instance since Sept 4 that one-hour PM2.5 readings have crossed the mid-range mark. Readings of between 56 and 150 indicate the elevated range.
@asiaone Did you notice the hazy skies on your morning commute? Here's a reminder to check the latest one-hour PM2.5 concentrations and follow guidelines for vulnerable groups if you are planning outdoor activities. #sgnews #Singapore #Haze #Health #Indonesia ♬ original sound - AsiaOne
In its daily haze situation update on Sunday, NEA said Singapore's 24-hour PSI forecast is expected to be in the moderate to low unhealthy range.
Explaining this, NEA stated that moderate to dense smoke plumes continue to be observed from fires in Kalimantan and southern Sumatra.
It has also observed smoke plumes from fires in Kalimantan drifting towards Singapore.
The agency added that while showers are forecast over northern Sumatra and north-western Borneo in the coming days, dry conditions are forecast over Kalimantan and southern Sumatra.
This, coupled with the prevailing southerly or south-easterly winds, means there remains a risk of transboundary smoke haze affecting Singapore, should fires in Indonesia persist.
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.
Those who are planning to conduct or participate in outdoor activities immediately can check the 1-hour PM2.5 concentration readings and vulnerable persons guide.
Meanwhile, those who are planning outdoor activities for the next day should use the 24-hour PSI forecast and the corresponding health advisories for planning.
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