N環球 
Singapore Air Quality Stays Unhealthy for Most of the Island on Tuesday
At 6am Tuesday, the 24-hour PSI reached 130 in central Singapore, 117 in the west, 112 in the east and 107 in the north — all in the unhealthy range; only the south stayed moderate.
Why it matters
The Indonesian haze season is again affecting daily life in Singapore. An 'unhealthy' PSI reading (101–200) means residents, especially the elderly, children and people with heart or respiratory conditions, should reduce prolonged or strenuous outdoor exertion.
Full report
Air quality in most of Singapore remained in the unhealthy range on Tuesday (Oct. 6). At 6am, the 24-hour Pollutant Standards Index (PSI) stood at 107 in the north, 112 in the east, 117 in the west and 130 in the central region — all above the 101 'unhealthy' threshold. Only the south, at 95, stayed in the moderate range.
The PSI is a 24-hour rolling average of six key pollutants. Hourly PM2.5 readings — used as a gauge for immediate activities — were elevated in three of the five regions: the east (56), west (59) and central (60). An hourly PM2.5 reading between 56 and 150 indicates an elevated concentration of fine particles.
Between 9pm and midnight on Oct. 4, the entire island was in the unhealthy range, peaking at 136 in the central region at midnight. The central and western regions have now spent at least 24 hours in the unhealthy band.
In its daily haze advisory on Oct. 5, the National Environment Agency (NEA) said that with prevailing winds expected from the south-east or east-south-east, the 24-hour PSI was forecast in the 'high moderate to mid unhealthy' range. Dry conditions persist over Kalimantan and southern Sumatra in neighbouring Indonesia, where moderate to dense smoke plumes are drifting towards Singapore. The PSI first crossed into the unhealthy range four weeks ago, on Sept. 4; the year's highest reading, 164 in central Singapore, was recorded on Sept. 29.
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