Singapore's air quality improves as PSI readings fall to moderate levels in south and north
On Sunday, Singapore's 24-hour PSI dropped out of the unhealthy range in the south and north, while hourly PM2.5 levels remained within normal limits across all regions.
Air quality across Singapore improved on Sunday, Oct 25, as the 24-hour Pollutant Standards Index (PSI) fell to moderate levels in the south and north. The southern reading dipped to 100 at 10 a.m., exiting the unhealthy band, and the northern reading reached 99 at 1 p.m. By 3 p.m., both regions were classified as moderate. Readings in the western, central and eastern parts continued to decline but stayed within the unhealthy range. Hourly PM2.5 concentrations were in the normal band throughout all five regions.
The National Environment Agency (NEA) had forecast PSI values between 80 and 130 for the day, covering both good-to-moderate and unhealthy bands. In its morning advisory, NEA reported scattered hotspots in Kalimantan and moderate to dense smoke plumes from hotspot clusters in Kalimantan, central Sulawesi and southern Papua. It noted that while showers could improve conditions in some areas, prolonged dry weather might keep haze levels elevated, posing a continued risk of transboundary haze.
NEA advised the public to consult the 24-hour PSI forecast when planning outdoor activities and to check the latest 1-hour PM2.5 readings before undertaking immediate outdoor tasks. When PM2.5 concentrations rise to the elevated band, healthy individuals should limit strenuous outdoor activities for the next hour, and vulnerable groups—including children, the elderly, pregnant women and people with chronic heart or lung conditions—should avoid such activities.