PUBLISHED ONOctober 13, 2026 1:25 AMBYSean LerAir quality remains in the unhealthy range across Singapore on Tuesday (Oct 13) morning, with 24-hour Pollutant Standards Index (PSI) readings in the high-unhealthy range in the western and central regions.
At 9am, PSI ranged from 127 in northern Singapore to 172 in western Singapore.
The next highest reading of 169 was recorded in central Singapore, while readings in the eastern and southern regions were 154 and 134 respectively.
Readings of between 101 to 200 are in the unhealthy range, with readings of 167 to 200 considered to be high-unhealthy.
Meanwhile, one-hour PM2.5 is in the elevated band across Singapore.
In western Singapore, the concentration reading briefly spiked to 171 — in the high band — between 9pm and 10pm.
In its daily haze situation update on Monday, the National Environment Agency (NEA) said that moderate to dense smoke plumes continued to be observed from fires in Kalimantan and southern Sumatra, while smoke haze was also observed drifting towards Singapore.
And while rain is forecast over Singapore and parts of the surrounding region, the agency pointed out that dry conditions are expected to persist over parts of southern Sumatra and Kalimantan.
Data from the ASEAN Specialised Meteorological Centre shows that the number of hotspots climbed to 142 in Sumatra on Oct 12, while there were 120 hotspots in Kalimantan on the same day.
"Smoke haze may continue to drift towards Singapore under the prevailing easterly or southeasterly winds.
"The 24-hr PSI for Singapore is forecast to be in the unhealthy range."
Members of the public are advised to check the latest PM2.5 concentration readings before engaging in outdoor activities.
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