Haze in Singapore: Normal PM2.5 and good to moderate 24-hour PSI readings islandwide
NEA said the PSI for Oct 27 is forecast to be in the 60-90 range.
Singapore's air quality remained healthy overnight, with hourly PM2.5 readings staying within the normal range and the 24-hour PSI rating between good and moderate across the island, according to data from the National Environment Agency (NEA). At 6am on Oct 27, PM2.5 levels in the five regions ranged from 14 to 32, while the 24-hour PSI stayed between 62 and 72.
PM2.5 readings are hourly measurements reflecting current air quality, with values from 0-55 considered normal and 56-150 indicating elevated fine particle concentrations. PSI, a 24-hour average of six key pollutants, indicates good to moderate air quality between 0-100 and unhealthy between 101-200. When air quality exceeds the "unhealthy" range, vulnerable populations should limit outdoor activities.
After weeks of poor air quality, residents experienced some relief over the weekend as PM2.5 levels remained normal in most areas, though 24-hour PSI readings stayed unhealthy in some spots. The NEA's Oct 26 haze advisory predicted the PSI for Oct 27 would range from 60-90, indicating good-to-moderate conditions. Smoke haze was observed over Kalimantan that day, with cloudy skies over Singapore.
The NEA forecast low likelihood of smoke haze affecting Singapore on Oct 27, due to favorable north-east or south-east winds and expected showers. For Oct 28 and 29, variable winds and showers were expected, potentially suppressing hotspot and smoke haze activity.
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