Key Takeaways
- • Hourly PM2.5 readings returned to the "normal" band across all five Singapore regions on the morning of Oct 25, with readings between 30 and 52 at 1pm, according to The Straits Times.
- • The 24-hour Pollutant Standards Index (PSI) remained in the "unhealthy" range (101-200) for three regions: east (106), west (124) and central (104).
- • The north (99) and south (97) regions registered "good to moderate" air quality on the 24-hour PSI.
- • The National Environment Agency (NEA) forecast moderate to unhealthy air quality on Oct 25, with PSI expected between 80 and 130.
- • NEA said smoke haze from Sumatra was drifting toward Singapore and was also observed over Kalimantan, with showers and south-west or west winds expected to help improve conditions.
Summary
Hourly PM2.5 readings returned to normal across all five regions in Singapore on the morning of Oct 25, even as the 24-hour Pollutant Standards Index (PSI) remained in the "unhealthy" range for three regions, according to The Straits Times. At 1pm, PM2.5 readings ranged between 30 and 52, within the "normal" band, which is defined as scores from zero to 55. Hourly readings had stayed in the elevated range from the evening of Oct 24 into the early hours of Oct 25.
The 24-hour PSI, a rolling average of six key air pollutants, stood at 106 in the east, 124 in the west and 104 in the central region, all in the "unhealthy" band of 101 to 200. The north (99) and south (97) registered "good to moderate" readings. When air quality breaches the unhealthy threshold, the elderly, children and those with health issues should begin scaling down outdoor activities. Air quality had briefly improved early on Oct 23, before conditions began to deteriorate on Oct 24.
In its daily advisory on the evening of Oct 24, the National Environment Agency (NEA) said moderate to unhealthy air quality was expected on Oct 25, with the PSI forecast in the range of 80 to 130. The agency said smoke haze from Sumatra was drifting toward Singapore and was also observed over Kalimantan on Oct 24.
NEA said winds from the south-west or west on Oct 25 could limit the drift of haze into Singapore, and showers expected over Singapore and the surrounding region may help. Winds are expected to continue from the south-west or west on Oct 26 and 27, and with showers forecast, the agency said the haze situation is "likely to improve".
The 24-hour PSI, a rolling average of six key air pollutants, stood at 106 in the east, 124 in the west and 104 in the central region, all in the "unhealthy" band of 101 to 200. The north (99) and south (97) registered "good to moderate" readings. When air quality breaches the unhealthy threshold, the elderly, children and those with health issues should begin scaling down outdoor activities. Air quality had briefly improved early on Oct 23, before conditions began to deteriorate on Oct 24.
In its daily advisory on the evening of Oct 24, the National Environment Agency (NEA) said moderate to unhealthy air quality was expected on Oct 25, with the PSI forecast in the range of 80 to 130. The agency said smoke haze from Sumatra was drifting toward Singapore and was also observed over Kalimantan on Oct 24.
NEA said winds from the south-west or west on Oct 25 could limit the drift of haze into Singapore, and showers expected over Singapore and the surrounding region may help. Winds are expected to continue from the south-west or west on Oct 26 and 27, and with showers forecast, the agency said the haze situation is "likely to improve".
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