SINGAPORE – The air quality in Singapore improved early on Oct 20, with much of the island awaking to only moderate levels of air pollution.
At 7am, the 24-hour Pollutant Standards Index readings were 89 in the north, 95 in the south and 98 in the east – in the normal range – while the readings for the west and central regions recorded unhealthy levels at 124 and 114 respectively.
Air quality is considered moderate when the PSI – a 24-hour rolling average of six key air pollutants – is in the range of 51 to 100, and unhealthy when it is in the range of 101 to 200. Beyond 200, it enters the very unhealthy band.
The haze situation in Singapore has improved since Oct 19, where three out of the five regions recorded moderate levels of air quality since 10am that day until now.
It marks a relative easing compared to conditions last week, when PSI readings remained in the unhealthy or very unhealthy bands on most days.
Meanwhile, hourly PM2.5 levels fluctuated between the normal and elevated bands.
At 7am, the PM2.5 readings were in the normal range in the north (49) and east (53), while those in the south (56), west (89) and central (75) were elevated.
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