Western Singapore recorded an hourly PM2.5 reading of 284 at 2pm on Wednesday (Oct 14), pushing that region into the very high band as hazy conditions held across the island. According to CNA, the 24-hour Pollutant Standards Index (PSI) sat in the unhealthy range in every region, with readings between 110 and 153.
The same 2pm update placed hourly PM2.5 readings in the High band for the south (159), east (195) and central (206) areas, CNA reported.
Why it matters
The figures land while Singapore remains under a haze episode driven by fires elsewhere in the region, and they sit close to thresholds that trigger government relief measures. Under plans announced by the Haze Task Force on Friday, N95 masks will be given to vulnerable groups once the 24-hour PSI crosses 200 into the very unhealthy band. Air-conditioned rooms at community clubs and selected residents' committee and residents' network centres will open as haze shelters at the same threshold.
Schools face a separate trigger. The Ministry of Education will weigh closures if the air quality forecast for the next day falls in the hazardous range, meaning a 24-hour PSI above 300.
The Straits Times reported that air quality at these levels is enough to activate Singapore's haze pollution law, and that the National Environment Agency (NEA) is tracking the situation.
What NEA says about the regional picture
In its Wednesday morning advisory, NEA said dry conditions had persisted overnight across much of the southern ASEAN region, with the exception of northern Sumatra, Borneo and Peninsular Malaysia, where rain fell.
The agency reported scattered to widespread hotspots in Kalimantan and southern Sumatra, and fewer hotspots elsewhere in the southern ASEAN region. It said monitoring stations in Peninsular Malaysia, Singapore, Kalimantan, Sumatra and western Sarawak logged air quality from unhealthy to hazardous, though cloud cover blocked a complete view of the smoke haze across parts of the region.
NEA expects dry weather to continue over parts of the southern ASEAN region in the days ahead, apart from Peninsular Malaysia and the northern and central areas of Sumatra and Borneo, where showers are forecast. Rain may ease the hotspot and smoke haze situation locally, the agency said, but fire-prone areas facing extended dry spells are likely to stay elevated, keeping the risk of severe transboundary haze in play.
Winds over the southern ASEAN region are forecast to come mainly from the east-southeast to south.
NEA had already projected on Tuesday that Singapore's air quality would stay unhealthy through Wednesday.
Health advice and who qualifies for masks
The task force, made up of 28 government agencies and led by NEA, has issued guidance for schools, workplaces, healthcare institutions and sporting activities.
Healthy individuals are advised against long or strenuous outdoor exercise. The elderly, pregnant women and children should cut outdoor activity to a minimum, while people with chronic heart or lung conditions should stay indoors.
When the 24-hour PSI exceeds 200, N95 masks will go to Pioneer and Merdeka generation members, Community Health Assist Scheme (CHAS) orange and blue cardholders, and ComCare Assistance recipients. Pregnant women, children aged seven to 16, and people with conditions such as asthma can collect masks at People's Association venues.
AsiaOne reported that thundery showers were forecast for Wednesday afternoon, which could bring some relief to the island.
What to watch: whether the 24-hour PSI climbs past 200, the level that unlocks mask distribution and haze shelters, and whether forecast rain over Sumatra and Borneo reduces hotspot activity in the coming days.
