Singapore’s government stood up a 28-agency Haze Task Force on Friday night and said it has stockpiled N95 masks for distribution to more vulnerable residents if the 24-hour Pollutant Standards Index crosses 200 into the “very unhealthy” band.

The move came as transboundary smoke from southern Sumatra and parts of Kalimantan kept air quality in the “unhealthy” range across the island. At 6 p.m., the National Environment Agency reported 24-hour PSI readings from 135 in the north to 192 in the central region — the highest level recorded since haze returned in September.

What the task force ordered

In advisories issued Friday evening, the task force — led by NEA — said it is “possible” the 24-hour PSI could exceed 200 despite showers expected over the weekend. Prevailing southeasterly to southwesterly winds may continue to push smoke toward Singapore, the agencies warned.

Mask reserves will be released through grassroots networks and social-service partners when the threshold is breached, officials said. The Ministry of Education added that schools would be considered for closure only if the next day’s forecast enters the hazardous band above 300.

Channel News Asia reported that employers were reminded to reduce outdoor work for vulnerable staff, while transport operators were told to monitor ventilation on buses and trains. Sporting bodies received separate guidance on postponing strenuous events when hourly fine-particle readings spike.

Readings and health guidance

NEA’s evening update said one-hour PM2.5 concentrations at 5 p.m. ranged from 91 to 134 micrograms per cubic metre, in the “elevated” band on the agency’s four-tier scale. The Meteorological Service Singapore noted moderate to dense smoke haze drifting from Sumatra, with some haze also observed over Kalimantan.

Health officials repeated that the 24-hour PSI underpins daily advisories, while the one-hour PM2.5 reading should guide immediate outdoor activity. Residents with heart or lung conditions were urged to cut back on prolonged exertion outdoors.

Grand Prix weekend in the haze

The poor air coincides with the Singapore Grand Prix, which draws hundreds of thousands of visitors to Marina Bay. Singapore GP told CNA it had no plans as of Friday evening to modify entertainment programming but would monitor conditions. The Singapore Tourism Board said contingency measures are tied to specific PSI and PM2.5 bands, with agencies prepared to coordinate if visibility or public-health risks emerge.

On the ground, retailers reported stronger demand for purifiers and masks, while some residents said they would scale back outdoor exercise even as concertgoers continued to queue for evening performances. NEA said it would publish updated forecasts on its haze microsite and the myENV app as winds shift.

The task force said agencies would reconvene Saturday morning to review overnight readings and decide whether to activate mask distribution or tighten workplace advisories. Officials urged employers to keep indoor air filters serviced and to offer flexible arrangements for staff with respiratory conditions if hourly particle levels remain elevated through the Grand Prix race schedule.