Air quality across Singapore no longer within unhealthy range
The 24-hour PSI for the central region dipped to 98 at 9pm on Sept 5.
Singapore's air quality has shown significant improvement, with the Pollutant Standards Index (PSI) across all five regions now falling within the moderate range. The central region, which previously reached unhealthy levels, saw its PSI dip to 98 at 9pm on September 5, following a high of 123 the night before. Similar trends were observed in the north (77), south (77), east (80), and west (90) regions, all of which remained in the moderate range as of 9pm on September 5.
The PSI readings in the east and west regions returned to moderate levels on the morning of September 5, after previously reaching unhealthy levels. Air quality is deemed unhealthy when the PSI ranges from 101 to 200, during which the public is advised to limit outdoor activities. The National Environment Agency (NEA) issued a haze advisory on September 5, stating that haze could persist, with air quality over the next 24 hours expected to fluctuate between higher end of the moderate category and the lower end of the unhealthy range.
This forecast is based on smoke plumes from fires in southern and central Sumatra, as well as parts of Kalimantan, which continue to drift towards Singapore.
The NEA began issuing daily haze advisories on September 4 after the central region's PSI entered the unhealthy range. These advisories now include a 24-hour PSI forecast, enabling the public to plan their activities and events accordingly. September 4 marked the first instance since 2023 that Singapore's PSI reading reached the unhealthy range due to haze.
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