Haze watch Oct 20: PM2.5 mostly low-elevated, but haze could return tonight
Residents in Singapore enjoyed a third consecutive day of better air quality on Tuesday (Oct 20) morning, with hourly PM2.5 mostly in the lower-end of the elevated band (56 to 150µg/m3).The current spell, which has seen concentration readings remain in the normal to low-elevated band and 24-hour Pollutant Standards Index (PSI) in the good-to-moderate to low-unhealthy range, is due to the turning of winds to blow from the south-southeast and showers in the vicinity.But some haze from Kalimantan and Sumatra was still observed in the vicinity of Singapore, said the National Environment Agency in its daily haze situation update on Monday evening.At 9am on Tuesday, the one-hour PM2.5 was in the normal band in the northern (44µg/m3) region. It is in the low-elevated band in southern (58), eastern (62), central (78) and western (84) Singapore.Meanwhile, PSI is in the good-to-moderate range (PSI 0 to 100) in the northern (89), southern (97) and eastern (98) regions, while remaining in the low-unhealthy range in central (114) and western (125) Singapore.