Haze watch Oct 22: PM2.5 normal islandwide, PSI moderate in 4 regions
Residents in Singapore on Thursday (Oct 22) woke up to better air quality for a fifth consecutive day — a run that began on Oct 18.While hourly PM2.5 and 24-hour Pollutant Standards Index (PSI) have not returned to levels recorded before Sept 4, when air quality entered the unhealthy range for the first time this year, hourly concentration readings have stayed in the normal to low-elevated bands over the past days.The improvement came as winds turned to blow from the south.At 8am, PM2.5 was in the normal band across Singapore.Meanwhile, PSI was in the good-to-moderate range in all regions, except in western Singapore with a low-unhealthy PSI of 108.