SINGAPORE – Residents in all areas across the island woke up to air quality in the good to moderate range early on Oct 23.
At 6am, the PM2.5 readings – a gauge of the current air quality – were 18 in the north, 26 in the south, 27 in the east, 53 in the west and 29 in central – within the normal range.
Scores from zero to 55 represent normal values, those between 56 and 150 indicate an elevated concentration of fine particles, while readings between 151 and 250 are considered high and scores above 251 are classified as very high.
The 25-hour Pollutant Standards Index stood at 68 in the north and south, 71 in the east, 89 in the west and 79 in central.
This means all the regions have had air quality in the good to moderate range – when normal activities can be carried out by everyone – for at least 24 hours. The west moved into this ideal category only at 3pm on Oct 22.
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