Air quality in four regions of Singapore fell into the unhealthy range on Monday, CNA reports, as haze continued to affect the country. The Straits Times reported that the Pollutant Standards Index (PSI) reached unhealthy levels in three regions, while PM2.5 readings spiked.
According to AsiaOne, air quality deteriorated over the day, with the 24-hour PSI forecast to reach the mid-unhealthy range. The Business Times reported that conditions were largely moderate across Singapore, though PM2.5 levels rose in most regions as the haze persisted. The National Environment Agency published a haze situation update dated 27 September 2026.
The reports differ on the number of regions affected — CNA cited four, while The Straits Times said three regions had entered the unhealthy range — and the material available does not explain the discrepancy. PSI and PM2.5 are the standard measures Singapore uses to describe haze conditions, and an unhealthy PSI reading indicates a level at which the general public may be advised to reduce prolonged outdoor activity.
The haze has persisted across the region in recent days, according to the NEA update and the outlets' coverage. No further details on the source of the haze or on any precautionary measures were included in the reporting summarised above.
Watch for the next NEA haze update and the following 24-hour PSI forecast, which will indicate whether conditions ease or worsen.
