Singapore's air quality improves with shifting winds but haze remains unhealthy

Singapore saw a modest improvement in air quality on Sunday after winds began blowing from the south, according to one outlet Environment Agency. Despite the shift, lingering haze from fires in Kalimantan kept the 24-hour Pollutant Standards Index between 106 and 186, still classified as unhealthy. Hourly PM2.5 concentrations measured between 37 and 69 micrograms per cubic metre, falling within normal to elevated levels.

The agency warned that while southern or south-southeast breezes may limit additional smoke from Kalimantan, haze originating over Sumatra could still move toward the island. A forecast of showers for the coming day supports the expectation of reduced haze transport. The 24-hour PSI for Monday is projected to vary from 101 to 190.