SINGAPORE: Air quality in central Singapore returned to the moderate range on Thursday (Sep 10), according to the National Environment Agency (NEA), with the 24-hour Pollutant Standards Index (PSI) in the region standing at 100 at 10pm.
The 24-hour PSI in the central region had crossed into the unhealthy range late on Wednesday, reaching 102 at 11pm, according to NEA.
It rose to 104 at 6am on Thursday, and fluctuated slightly through the day before sitting at 102 at 9pm and dropping to 100 an hour later.
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