Haze watch: Unhealthy air quality across Singapore, PSI in west crosses 160
Residents in Singapore woke up to unhealthy air quality across the country on Thursday (Oct 8), with 24-hour Pollutant Standards Index (PSI) readings remaining in that range across all five regions.At 9am, PSI ranged from 113 in northern Singapore to 161 in the western region.The next highest recordings were recorded in central (145) and eastern (125) Singapore.But one-hour PM2.5 concentration readings have improved overnight, returning to the normal band in southern (25), eastern, (42) and northern (37) Singapore.The highest concentration reading of 61 was recorded in western Singapore.Concentration readings between 56 to 150µg/m3 fall within the elevated band, while readings between 151 and 250 are in the high-band — briefly recorded in western Singapore at 4pm on Wednesday.