Air quality in all 5 regions of Singapore in the unhealthy range
Readings for the north crossed the 101 threshold at about 1am.
On September 15, all five regions of Singapore experienced unhealthy air quality levels, according to the 24-hour Pollution Standards Index (PSI). At 6am, the PSI readings for the north (104), south (111), east (128), west (128) and central (154) regions were all within the unhealthy range. The National Environment Agency (NEA) recommends that people reduce outdoor activities during this time, as unhealthy air quality levels can pose health risks.
The previous day, September 14, the air quality had worsened across the island, except for the north, with several days of moderate air quality preceding the unhealthy levels. The PSI reading for the north crossed the unhealthy threshold at around 1am on September 15, rising from 99 to 102. PM2.5 readings, which measure fine particles in the air, largely returned to normal levels after peaking in the central and west regions.
However, elevated PM2.5 levels were observed in the central (66) and west (59) regions. The NEA forecast that air quality would remain in the high moderate to mid-unhealthy range for the next 24 hours, attributing the worsening air quality to haze caused by forest fires in Kalimantan and southern Sumatra.
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