PUBLISHED ONSeptember 30, 2026 11:19 AMBYSean LerModerate to heavy thundery showers across the northern, western and central areas of Singapore on Wednesday (Sept 30) afternoon helped keep the haze at bay, with 24-hour Pollutant Standards Index (PSI) continuing to fall towards the moderate range.
At 6pm, the 24-hour PSI readings ranged from 91 in northern Singapore, to 112 in the central region. This is in the moderate to unhealthy range.
Meanwhile, the one-hour PM2.5 reading is between six and 18, in the normal band. Concentrations readings of between 0 to 55 denote the normal band.
In its daily haze situation update on Wednesday evening, the National Environment Agency (NEA) said the country's 24-hour PSI is forecast to be in the moderate to low-unhealthy range.
This is an improvement from the high-moderate to mid-unhealthy forecast a day earlier.
Smoke haze from southern Sumatra and Kalimantan was observed to have drifted towards Singapore, NEA noted.
Along with the prevailing south-easterly or southerly winds, the risk of smoke haze affecting Singapore remains, it added.
Members of the public are advised to check the one-hour PM2.5 concentration readings before participating in any immediate outdoor activities.
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