PUBLISHED ONSeptember 16, 2026 11:22 AMBYSean LerShowers over parts of Kalimantan, where hotspots have been detected, contributed to improvements to Singapore's air quality on Wednesday (Sept 16), although haze risks remain.
Data from the National Environment Agency (NEA) showed that 24-hour Pollutant Standards Index (PSI) at 11am was in the moderate range for all regions in the city state.
At 5pm, 24-hour PSI was between 71 and 89, with central Singapore recording the highest reading of 89. Readings of between 51 to 100 denote moderate air quality.
Meanwhile, one-hour PM2.5 concentrations — an indicator of fine particulate matter in the air and a measure of current air quality — is in the normal band for all regions except for central Singapore, which has a concentration reading of 59.
PM2.5 readings of between 56 to 150 are in the elevated band.
In its daily haze situation update on Wednesday evening, NEA said it expects Singapore's 24-hour PSI forecast to remain in the moderate to low unhealthy range over the next 24 hours.
Explaining this, the agency noted that its weather satellite pass at 1.41pm showed that some smoke haze was observed to have drifted from the southern parts of Sumatra towards Singapore.
This, coupled with prevailing winds forecast to blow from the southeast or south, means that some risk of haze affecting Singapore remains.
Members of the public should note that the health impact of haze depends on one’s health status, the PSI level, and the length and intensity of outdoor activity.
For immediate outdoor activities, the public should check the 1-hour PM2.5 concentration readings and corresponding health guidance. For planning outdoor activities for the next day, they should refer to the 24-hour PSI forecast and relevant health advisories.
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