Singapore’s air quality remained in the Moderate range on the evening of 25 September, with the 24-hour Pollutant Standards Index (PSI) ranging from about 61 to 79 at 6pm.
The Central region recorded the highest PSI reading among the regions, while one-hour PM2.5 readings stayed within the normal band.
The National Environment Agency (NEA) said showers forecast over Singapore and the surrounding region on 26 September could help reduce the risk of smoke haze affecting Singapore.
Fires In Sumatra And Kalimantan Continue To Be Watched
Smoke haze conditions remained linked to ongoing fires in parts of Sumatra and Kalimantan.
NEA’s haze updates have noted that dry conditions over parts of these areas have contributed to smoke plumes from fires, with weather conditions and wind direction affecting whether haze may drift towards Singapore.
As of the evening update, the 24-hour PSI was still within the Moderate range. The PSI measures air quality over a 24-hour period and is used for planning activities, while one-hour PM2.5 readings provide a more immediate indication of fine particulate matter levels.
Showers Could Help Reduce Haze Risk
NEA said showers expected on 26 September could help lower the risk of smoke haze affecting Singapore.
However, dry conditions were still expected in some parts of southeastern Sumatra and southwestern Kalimantan, meaning smoke haze risk would depend on whether fires continue and how winds carry smoke towards the region.
Residents can continue checking the latest air quality updates before planning prolonged outdoor activities, especially those who may be more sensitive to haze conditions.
What The PSI Levels Mean
NEA advises people to refer to one-hour PM2.5 readings for immediate outdoor activities and the 24-hour PSI forecast when planning activities for the following day.
When the 24-hour PSI is in the Moderate range, healthy individuals can generally continue normal activities. Those who are more sensitive to haze should consider their health conditions and reduce prolonged or strenuous outdoor activities if air quality worsens.
