Singapore’s air quality deteriorated overnight as the 24-hour Pollutant Standards Index (PSI) climbed into the unhealthy range across all five regions of the island on Saturday, Oct. 24. By noon, PSI readings ranged from 116 to 152, with the western region recording the highest levels.
Regional Haze and Forecast
The National Environment Agency (NEA) attributed the decline to smoke haze drifting from Sumatra, compounded by persistent dry conditions. While scattered hotspots have been identified in southern Sumatra and Kalimantan, the NEA expects the PSI to remain between 90 and 140 throughout the day. Although showers are forecast for Saturday, which may provide some relief, the agency noted that prevailing winds could continue to transport smoke toward the city-state.
Conditions are expected to show improvement starting Sunday as wind patterns shift. In the meantime, the NEA has advised the public to monitor 1-hour PM2.5 readings before planning outdoor activities. Vulnerable groups—including children, the elderly, and those with chronic heart or lung conditions—are encouraged to minimize strenuous outdoor exertion.
Regulatory Action
The worsening air quality coincides with increased government efforts to address the source of the pollution. On Friday, the NEA issued notices to 10 Singapore-based companies under the Transboundary Haze Pollution Act, requiring them to provide information regarding their land concessions and fire prevention measures. Additionally, the Ministry of Law is establishing a specialist panel to investigate corporate links and supply chains to determine if companies are responsible for the fires contributing to the regional haze.
