Haze update Sept 21: Showers over Singapore keep air quality moderate, 24-hour PSI forecast moderate to low-unhealthy
Air quality in Singapore remained in the moderate range on Monday (Sept 21) as moderate to heavy thundery showers fell across Singapore in the afternoon.At 6pm, the 24-hour Pollutant Standards Index (PSI) is between 66 and 81 — in the moderate range — with the highest PSI of 81 recorded in central Singapore.Meanwhile, one-hour PM2.5 is in the normal band across all five regions in Singapore.In its daily haze update on Monday evening, the National Environment Agency (NEA) said it expects the 24-hour PSI forecast to be in the moderate to low-unhealthy range.The agency stated that the risk of smoke haze affecting Singapore remains due to the prevailing south-easterly winds.Meanwhile, moderate to dense smoke plumes continue to be observed from fires in Kalimantan and southern Sumatra during its weather satellite's pass at 1.49pm.