Haze in S’pore: Air quality in central region slips back to unhealthy range
At 7am on Oct 4, the PSI reading in the central region was 102.
Singapore's central region saw its air quality dip back into the unhealthy range overnight, according to the 24-hour Pollutant Standards Index (PSI) reading. At 11pm on Oct 3, the PSI dropped temporarily to the moderate range before climbing back up to 103 at 3am on Oct 4, indicating unhealthy levels. The PSI for the rest of Singapore remained in the moderate range, from 78 to 90 at 7am on Oct 4.
The PSI measures air quality over a 24-hour period based on six key pollutants, with readings between 101 and 200 considered unhealthy, necessitating a reduction in outdoor activities. When the 24-hour PSI reached 102 at 11am on Oct 3, it marked the first time that region had hit unhealthy levels since 10pm on Sept 30. Meanwhile, one-hour PM 2.5 readings, which gauge immediate air quality, were within the normal range.
NEA forecast that PSI would remain in the "moderate to low unhealthy" range, with smoke plumes from southern Sumatra and Kalimantan contributing to the haze. The last time the PSI reached unhealthy levels due to haze was a month ago, on Sept 4.
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