SINGAPORE – The hazy conditions persisted overnight with the central part of Singapore worst hit as the PSI reading there entered the “very unhealthy” range at midnight, while the hourly PM2.5 readings fluctuated between the “elevated” and “high” bands islandwide.
At 6am on Oct 16, the 24-hour Pollutant Standards Index (PSI) in the central region stood at 221, hitting a new high for this haze season. The rest of the island recorded PSI readings in the unhealthy band at that time: west (193), east (192), south (178) and north (145).
Air quality is considered unhealthy when the PSI – a 24-hour rolling average of six key air pollutants – is in the range of 101 to 200 and very unhealthy when it is in the range of 201 to 300.
The hourly PM2.5 readings – measured in micrograms per cubic metre and used as a gauge for current air quality – were hovering between the “elevated” and “high” bands across the island at 6am: east (160), central (150), west (148), south 113) and north (99).
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